ML18037A198

LER 79-020/03L-0:on 790901,during Steady State Operation, Drywell Cooler 14 Tripped & Leakage Increased to Above Five G/Minute.Caused by Cooler Tube Leak.Cooler Isolated & Returned to Acceptable Level.Shutdown Terminated

ML18037A198
Person / Time
Site:	Nine Mile Point
Issue date:	09/10/1979
From:	Duda E NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18037A196	List: ML18037A195 ML18037A197 ML18037A198
References
LER-79-020-03L, LER-79-20-3L, NUDOCS 7909170521
Download: ML18037A198 (2)

Text

~ ~ 4 4 4 (7.77) r LlCENSEE EVENT REPORT N

CONTROL BLOCK:

,Q (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 8 9 N Y N H LICENSEE CODE P 1 14 Q20 15 0 - 0 LICENSE NUMBER Q3 LICENSE TYPE 30 Q~Q 57 CAT 58 CON'T

~01 7 8 soURGE LQQB 60 61 0 0 0 DOCKET NUMBER 2

68 0 69 EVENT DATE 74 QB 75 REPORT DATE 80 QB EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO Durin stead state o eration No. 14 Dr well Cooler tri d and dr 11 leaka e increased to above five m. Since dr well coolers are su lied b Reactor Bui 1 din Cl osed Loo Cool in it was a arent that the un-

~os identified leaka e was robabl not reactor coolant however unit shut-

~OB down was commenced er Technical S ecification Para ra h 3.2.5. The cooler was then isolated and unidentified leaka e returned to below five

~OB g m, thus this event resulted in minimal safet im lications.

7 8 80 LEANDRO SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENTCODE SUBCODE SUBCODE

~OB ~SB 10 Q>> E Q>> ~XQ15 H T E X C H 04 ~CQ75 19

~Z 20 Q75.

7 8 9 11 12 13 18 SEOUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.

Q17 REPORT ~79 21 22 Q

23

~02 24 0

)26 Q~

27

~03 28 29 QL 30 Q31 32 0

ACTION . FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD 4 PRIME COMP. COPVIPONENT TAKEN ACTION ON PLANT METHOD HOURS +22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

~XQ15 ~BQ70 ~BQEO ~ZQEE 0,'0 0 Z N Qss ~NQ74 ~A QE5 B 5 I 5 QEE 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 )

o It i s assumed that uni denti fied 1 eaka e increased due to a tube 1 eak in No. 14 Drywell Cooler. This is based on the fact that once the cooler was isolated, unidentified leakage dropped to 1 ~ 2 m. After this cor-3 rective action returned leakage to an accpetable level, the shutdown 4 was terminated.

7 8 9 80 FACILITY STATUS 5I'PPOWER OTHER STATUS Q METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32 Qss ~09 3 Qss NA ~AQ31 Equi pment failure 7 8 9 10 12 Ig 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE Z

AMOUNT OF ACTIVITY Q NA LOCATION OF RELEASE QSB LJZ Q33 Q34 7 8 9 10 45 80 EXPOSURES 44'ERSONNEL NUMBER TYPE DESCRIPTION QSB 7 ~00 0 QET Z Qss NA 7 8 9 11 12 13 80 PERSONNEL INJURIES NUMBER OESCRIPTIONQ

~OO 0Q40 7 8 9 11 12 80 9

LOSS OF OA DAMAGE TO FACILITY TYPE Z

DESCRIPTION NA Q

Q42 8 9 10 80 PUBLICITY 7 9091vo ++I NRC USE ONLY 407 04 7

7 8 9 10 68 69 80 0

NAME OF PREPARER PHONE (315)343-2110 X 1306 L 53

P 4