Page 34 - AERB

A.3 Pressurized Heavy Water Reactor (PHWR) Based outlet temperature monitoring system (CTMS) RTD
NPPs performance test etc.

(i) KAPP-3&4 and RAPP-7&8 NPCIL submitted an application seeking permission
for draining and drying of PHT System for KAPP-3 after
Safety review of various submissions for the twin completion of PHT related commissioning tests. After
units of 700 MWe PHWRs at Kakrapar, Gujarat (KAPP- satisfactory review, permission for draining of Light
3&4) and Rawatbhata, Rajasthan (RAPP-7&8) is in water from PHT system was granted on December 16,
progress. Review Groups in AERB are progressively 2019.
reviewing relevant submissions on Safety analyses,
Stress analysis reports, Environmental Qualification In KAPP-4, civil construction and erection of
(EQ) reports, Independent Verification and Validation equipment/ components are under progress. Pre-
(IV&V) reports, Commissioning Procedures for both stressing activity of Unit-4 Inner Containment was
projects, Commissioning reports of KAPP-3 and completed.
Technical Specifications for Operation.
As part of flood mitigation measures for KAPP-1
NPCIL application for authorization of Primary to 4, construction of box culverts in two of the three
Heat Transport (PHT) System Hot Conditioning and identified portions was completed and opened to public.
Light Water Commissioning (LWC) of KAPP-3 was Lowering of adjacent ground surface to a specified level
reviewed and clearance for KAPP-3 hot-conditioning on both sides of box culvert is in progress. Process for
and associated hot tests was granted on August 07, initiating the work of third portion is under progress.
2019.

Subsequently, NPCIL submitted an application for
seeking permission for remaining LWC tests of KAPP-
3. After satisfactory review, clearance for balance LWC
tests was granted on November 01, 2019.
Based on review observations, some of the
commissioning tests (in PHT hot condition) were
repeated at KAPP-3, e.g. Passive decay heat removal
system (PDHRS) test, PHT pressure decay test,
Shutdown cooling pump hot valve-in test, Channel
KAPP-3&4 Main Plant Area

AERB Team along with Plant Personnel during Commissioning of KAPP-3

6 AERB Annual Report 2019