ML19345F278

LER 81-015/03L-0:on 810114,contrary to Tech Spec,Unit 1 Hydrogen Recombiner Sys Removed from Svc.Caused by Performance of Piping Mod.Recombiner Returned to Svc

ML19345F278
Person / Time
Site:	North Anna
Issue date:	02/09/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345F277	List: ML19345F275 ML19345F278
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8102170093
Download: ML19345F278 (2)

Text

. . _ _ . _ _ = _ _ _ _. . _ . _ _

s U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATI0h,

/0/1/ /V/A/N/A/S/2/ (2) /0/0/-/0/0/0/0/0/-/0/0/.(3) /4/1/1/1/1/ (4) / / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT I

G/ (6) /0/5/0/0/0/3/3/9/ (7) /0/1/1/4/8/1/ (8) /0 /2 /0 /9 /8 /1/ (9)

DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

{ /0/2/ / On January 14, 1981, during mode 1 operation, the hydrogen recombiner system /

. /0/3/ -/ was removed from service for piping modifications contrary to T.S. 3.6.4.2. /

/0/4/ / Since the redundant hydrogen recombiner was returned to service within 30 days /

/0/5/ / as required by the action statement and the Unit 2 hydrogen recombiner remained /

, /0/6/ / operable, the health and safety of the public were not affected. This event /

/0/7/ / is reportable pursuant to T.S. 6.9.1.9.6. /

I

/0/8/ / /

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE i /0/9/ /S/E/ (11) /X/ (12) /Z/ (13) /X/X/X/X/X/X/ (14) /Z/ (15) /Z/ (16)

SEQUENTIAL OCCURhENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT

.W1BER /8/1/ /-/ /0/1/5/ /\/ /0/3/ /L/ /-/ /0/ _

ACTION -FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT

TAKEN ACTION ON PLANT METHOD' HOURS

• SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/_Z/ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) /Y/ (23) /N/ (24) g/ (25) /R/3/4/4/ (26)

'CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/i/0/ / The Unit I hydrogen recombiner was removed from service to perform a piping /

/1/1/ / modification. When completed, the recombiner was returned to service. /

/1/2/ / /

/1/3/ / /

/1/4/ / /

< FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DESCRIPTION (32) ,

/1/5/ ) DISCOVERY ~

[E/ (28) /1/0/0/ (29) / NA / -( g/ (31) / NA / ,

ACTIVITY CONTENT

RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ /Z/ (33) /Z/ (34) / - NA / / NA /

PERSONNEL EXPOSURES

NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z[ (38) / NA /

PERSONNEL INJURIES NUMBER .

DESCRIPTION (41)

/1/8/ /0/0/0/ (40) / NA /

LOSS OF.OR DAMAGE TO FACILITY 3

TYPE DESCRIPTION G3)-

/1/9/ /Z/ (42) / NA / I PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY j /_2/ q ' /N/ (44) / NA- -/ /'/'/ / / / /-/ / / /'/

t i

NAME OF PREPARER W. R."CARTWRIGHT -PHONE .(703) 894-5151 810217 0% - . - - , . - . - . .- - -. .-. -

i

. 6 Virginia Electric and Power Company North Anna Power Station, Unit #2

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 81-015/03L-0 l-Description of Event On January 14, 1981, the Unit I hydrogen recombiner was removed ,

from service to perform piping modifications. Since the Unit 2 Technical '

Specification 3.6.4.2 requires two independent hydrogen recombiner systems (shared with Unit 1) be operable, the provisions of the action ,

statement were instituted. This item is reportable pursuant to.T.S.  ;

6.9.1.9.b.

! Probable Consequences of Occurrence l The hydrogen recombiner systems are required for post - LOCA hydrogen control resulting from the zirconium water reaction, radiolytic decomposition of water and from corrosion of metals within containment. Each single recombiner has a capacity capable of controlling the expected hydrogen generation during post - LOCA conditions. Since the Unit 2 recombiner remained operable, there was no effect on the health and safety of the public.

Cause of Event The Unit I hydrogen recombiner was removed from service to perform a piping modification. Misaligned expansion joints at the recombiner were replaced and correctly aligned.

Immediate Corrective Action j

The provisions of the T.S. 3.6.4.2' action statement were implemented.

When the piping modification was completed,.the system was restored to its normal configuration.

Scheduled Corrective Action No further action required.

Actions Taken to Prevent Recurrence No further action required.

Generic Implications

! This event has no generic ~ implications.

+

,y + _.- -e , _ _ _ _ - -- _ , . __ y ,