ML19318D091

Revised LER 80-018/01X-1:on 800508,during Ongoing Hanger base-plate Analysis,Both Svc Water Headers Declared Inoperable.Caused by Supports Not Providing Factor of Safety Greater than Two.Redesign & Mods Completed 800621

ML19318D091
Person / Time
Site:	Millstone
Issue date:	06/27/1980
From:	NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19318D086	List: ML19318D085 ML19318D091
References
IEB-79-02, IEB-79-2, LER-80-018-01X, LER-80-18-1X, NUDOCS 8007070324
Download: ML19318D091 (2)

Text

{{#Wiki_filter:hh ,. LICENSEE EVENT REPORT f cONinOL DLOCK: l l l l l l 6 lh (PLE ASE rnlNT On TYPE ALL REQUf ntD INF OnMATION) fi) I C I T I M Lttis l 21@l ol 01 -l ol ol ol 01 - 1010101@l l Ig LICErdLE PJUf/UEH 2h 2641 EaCENSE lj 111l TYPE1 J@l JD bl C A1 b8 LICEt45EE COOL 14 16 i 5 9 >N'T T LB "Ols lij@lo I s Io Io lo 1313 16 l@l 08 o i 5101a f4 EVENT DATE i81o i@io I sHEPOHY 74 73 12 l DATE 7 ia lo80l@ S 60 6l DOCKET tJUMUER EVENT DESCniPTION AND PnODADLE CONSEQUENCES h g-p [ During the on-going lianger base-plate analysis for NRC IE Bulletin 79-02, and with t E I plant at 100% power, both service water heade'rs were declared inoperable which resulted d - .I E lin__ plant operation per Tech Spec 3.0.3 since conditions were in excess of those With the plant in cold shut- l

@ l addressed in the Action Statement of Tech Spec 3.7.4.1.

@ l own d for service water support repairs, it was determined on 5/29/80 that hangers on the] i QB l A and B Reactor Building Closed Cooling Water (RBCCW) headers did not provide a factor Both RBCCW headers were declared inoperable. I g [ of safety _ greater than two (2_). 80 COMPONEtJT CODE SUBC dE $U DE C DE CODE SUSC E

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43 lBl11310l@ 44 47 36 3# 48 42 33 34 Jb CAUSE DESCniPTION AND CONNECTIVE ACTIONS h I i l O I l The cause of scrvice water and RCCCW headers declared inoperative was determination i lil I that presently installed supports did not provide a factor of safety greater than two._ J l ij21 1 Since 6/9/80, the plant has been in cold shutdown as required per Tech Spec 3.0.3. I

     , i ., i l Redesign and modification of service water, RBCCW and other safety-related system J

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3 ATTACHMENT - LER 80-18/lX-0 Millstone Unit 2 Docket No. 50-336 EVENT DESCRIPTION: During the on-going hanger base-plate analysis for NRC IE Bulletin 79-02, it was determined that several se'rvice water support hangers did not provide a factor of safety greater than two. Therefore, both service water headers were declared inoperable which resulted in plant operation per Technical Specification 3.0.3 since conditions were in excess of those addressed in the Action Statement of Technical Specification 3.7.4.1. Accordingly, preparations were made to Proceed to place the plant in cold shutdown within 30 hours. With the plant in cold shutdown for service water support repairs, it was determined on 5/29/80 that several hangers on the A and B Reactor Building Closed Cooling Water (RBCCW) headers did not provide a factor of safety greater than two (2). Both RBCCW headers were declared inoperable. CAUSE DESCRIPTION AND CORRECTIVE ACTION: , The cause of service water and RBCCW headers declared inoperative ivas 'etermination that presently installed hangers did not provide a factor of safety greater than, two (2). Since 5/9/80, the plant has been in cold shutdown as required per Technical Specification 3.0.3. A pipe stress analysis run with the effected hangers removed showed the potential for piping overstress conditions. Work commenced 4 in parallel with the analysis of additional systems identified for further review under 79-02 to upgrade all effected hangers. Redesign and modification of service water, RBCCW and other safety related System supports with a factor of safety less than two (2) was completed on 6/21/80. The following tabulation indicates the total number of hangers that required rework per NRC IE Bulletin 79-02 during this outage: Number of Hangers Affected Service Water 23 RBCCW 19 Main Steam 8 HPSI 6 LPSI 3

          . Safety Injection                       9 Feedwater                               2 Auxiliary Feedwater                     5 Containment Purge                        1 Containment Spray                       3 Reactor Coolant                          1 Diesel Generator                        1 TOTAL                                 8T -
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