ML18037A281

LER 80-014/03L-0:on 800717,during start-up Performance for IE Bulletin 80-17 Auto Scram Test,Operability Test Attempted on Valve During Shutdown Period.Valve Failed to Open Upon Manual Initiation.Valve Removed & Disassembled

ML18037A281
Person / Time
Site:	Nine Mile Point
Issue date:	08/08/1980
From:	Harrison P NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053B860	List: ML17053B859 ML18037A281
References
LER-80-014-03L, LER-80-14-3L, NUDOCS 8008250571
Download: ML18037A281 (4)

Text

NRC,F, '86 U. S. NUCI.EAR REGULATORY COMMISSION (7 77I LlCENSEE EVENT REPORT

~ 'ONTROL BLOCK: (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI 1 r QI 7 8 9 N Y H LICENSEE CODE H P 14 Qz 15

" 0 LICENSE NUMBER 0 0 0 0 25 Q34 26 1 1 1 LICENSE TYPE 1

30 Q4~Q 57 CAT 58 CON'T

~o 7 8 60 61 DOCKET NUMBER 68 Q7 69 F VENT DA fE 74 QB 75

~

REPORT DATE Q

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES IO Durin a routine start-u to erform I.E. Bulletin 80-17 auto scram test an o er-3 ability test on IllilElectromatic Reli.ef valve was attempted as a result of maint-enance performed on tha valve during the preceding shutdown period. The valve

~o s failed to open upon manual initiation from the control room. The reactor was sub-

~a s sequently scrammed as scheduled. and the valve was then removed and disassembled

~o 7 to determine the cause of failure.

~os 80 7 8 9 SYSTEh: CAUSE CAUS= COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODr

~CC Qll A Qlz ~0Q13 V A L V E X Q14 ~HQ1'H

'7 O ln 11 13 12 16 147 1 SEQUENTIAL OCCURRENCE REPORT Q>>

LE R PAO REPoRT ACTION ~ FUTURE EVENT YEAR

~80 23 22 EFFECT 23 SHUTDOWN

~01 74 REPORT NO.

4 2G

~~

27 ATTACHhlENT

~03 2"

CODE 219 NPROR TYPE

~L 30 PRIME COMP.

~31 NO.

~0 3e COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~22 SUBMITTED FORM huB. SUPPLIER - MANUFACTURER Qls ~.Qls 3>>

~ZQzo 35

~ZQ 3G 0 0 0 0 40 41 N

Qzz ~NQ34 47

~NQzs 44 0 2 4 3 47 Qzs a3 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o SEE ATTACHED

~74 7 8 9 80 FACILITY STA'TUS

~01 44P POYYEA 1 N.

OTHER STATUS Q METHOD OF DISCOVERY Operator Observation DISCOVERY DESCRIPTION QS

~C Qzp Qzo ~C Q31 7 lf 12 I3 44 44 aG 80 ACTIVITY CONTEN'I RELEASED OF AELEASF

~zQ33 z Q34 AMOUNT OF ACTIVITYQB NE'4 LOCATION OF RELEASE Q 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION QSB

~77 8

~00 9

Q Gll L~ J Q33 13 NA 7 11 12 80 PERSONNEL INJURIES NUMBEA DESCRIPTIONQ

~OO O Q4o NA 7 8 9 11 12 80 LOSS OF OR DAMAGE To FACILITY TYPE DESCAIPTION Q43 o Z Q43 N:.

7 8 EJ ISSUED

.uBL,clTY 10 DESCRIPTION ~45

~ 8008g~5o 9VI NRC USE ONLY 80

~zo '~~Q44 NA 8 9 10 68 69 80 o Paul Harrison Nh Abc rlc DRcD h RcR PHONE315-343-2110 ext. 12 2

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS dl There are two designs of the valve disc retainer used at 9MP Unit 81 for maint-enance of the electromatic relief valves. The first contains a drilled and tapped hole through the pressure retaining portion (for manufacturing and installation purposes) requiring a bolt to be installed to seal the pressure boundaiy. The second design does not incorporate a through-wall hole, thus eliminating the need for the volt installation. Inspection of the valve revealed that the first design of the disc retainer had been used, and that the bolt plug had been inadvertently missed during the previous assembly of the valve. This resulted in the inability of the valve disc to experience the sufficient pressure differential required to open the valve. Consequently, the bolt was installed and the valve was reinstalled.

During the next reactor start-up the valve was satisfactorily tested for opera-bility. In addition, a training session was held with the mechanical maintenance personnel to review the disc retainer designs and their correct installation.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS There are two designs of the valve disc retainer used at 9MP Unit /f1 for maint-enance of the electromatic relief valves. The first contains a drilled and tapped hole through the pressure retaining portion (for manufacturing and installation purposes) requiring a bolt to be installed to seal the pressure boundaiy. The second design does not incorporate a through-wall hole, thus eliminating the need for tne volt installation. Inspection of the valve revealed that the first design of the disc retainer had been used, and that the bolt plug had been inadvertently missed during the previous assembly of the valve. This resulted in the inability of the valve disc to experience the sufficient pressure differential required to open tne valve. Consequently, the bolt was installed and the valve was reinstalled.

During the next reactor start-up the valve was satisfactorily tested for opera-bility. In addition, a training session was held with the mechanical maintenance oersonnel to review the disc retainer designs and their correct installation.