Page 39 - AERB Annual Report 2020

1.2.1 NPPs UNDER CONSTRUCTION: Submissions related to Core Catcher were
REVIEW STATUS earlier reviewed and permission was given for
erection of Core Catcher. Erection activity of Core
Safety review activities related to the Catcher which has been completed along with its
Nuclear Power Projects (refer Table 1.1) support structures. Construction activities
continued during the year. remained in progress for other safety related
buildings. For safety systems building (UKA),
Due to COVID-19 pandemic situation, construction activities are completed till - 4.25 m
utility submissions were communicated to elevation (EL) and building was released for
reviewers (Committee Members as well as AERB mechanical works. The support truss for Reactor
Ofcers) through e-mail and review observations pressure vessel was shifted to site and its pre-
were sought. Online meetings were conducted assembly was taken up. Also analyses for design
through video-conferencing to deliberate and check locations for essential loads pump house
nalise the safety review observations. In view of (UQC) were considered acceptable and
the situation arising from the COVID-19 communicated to NPCIL in May 2020.
pandemic, Nuclear Facilities under construction/
commissioning were requested to provide the Review of revised (Rev.1) Preliminary Safety
status of preservation aspects of Structures, Analysis Report (PSAR) w.r.t. Reactor Coolant
Systems and Components (SSC), Industrial and System, Engineered Safety Features, Radioactive
Fire Safety (I&FS) etc. Reports submitted by sites Waste Management System and Radiation
were noted for measures instituted for Protection was completed. Whereas review of
preservation, protection of SSCs, other revised PSAR (Rev.1) on Electrical Systems,
equipment and Industrial and Fire Safety aspects. Control & Instrumentation, Auxiliary Systems
etc., was nearing completion. In addition, review
A1. Light Water Reactor based NPPs of PSAR (R-0) on Accident Analyses, Conduct of
Operation, Initial Test Program etc., was in
(i) Kudankulam Nuclear Power Project-3&4 progress.
(KKNPP-3&4)
Reports on geological mapping,
KKNPP Unit-3&4 plant design is a repeat design conrmatory geotechnical investigations, design
of KKNPP Unit-1&2, which was extensively and analysis for essential loads pump house
reviewed in AERB. Review process for Unit-3&4 (UQC) building structure were satisfactorily
is optimized to review of design differences reviewed by AERB, and NPCIL was permitted to
impacting safety and compliance to AERB take up the construction of UQC.
requirements. AERB gave clearance for First Pour
of Concrete (FPC) on June 23, 2017 with certain AERB carried out review of design
stipulations. Presently, civil construction work is adequacy checks for critical locations of civil
in progress at KKNPP-3&4. NPCIL has submitted structures following AERB safety standards, and
Application for Erection of Major Equipment of concrete mix designs for normal and heavy
(EME) in August 2020. The application was concrete.
conditionally admitted, pending submission of
supporting documents.

Under construction Main Under Construction Liner Erection Works
Pump-house Intake Tunnels in Reactor Building of KKNPP-4

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AERB Annual Report 2020