ML18136A321

LER 79-035/03L:on 791127,during Normal Operation,Routing Surveillance Revealed Failure of Heat Tracing Circuit 2B (Panel 8),Unit 1 Suction Piping to Boric Acid Transfer Pump 1-CH-P-2A.Caused by Water Damage.Heat Tape Replaced

ML18136A321
Person / Time
Site:	Surry
Issue date:	12/21/1979
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18136A319	List: ML18136A318 ML18136A320 ML18136A321
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912270592
Download: ML18136A321 (2)

Text

NRC FORM 366 (7-77) e U. S-LEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK:~'

1 6 . (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

[U2] IVIAjs IP 1s II IG)jO 10 I-lo 10 10 10 10 I-10 10 1014 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 11 1 1 1 1 1 1 101 I 10 LICENSE TYPE 30 57 CAT 58 CON'T 7 B LJG)I o I s Io Io Io 12 ! 8 I o 101 11 1 1 2 I 11 11 9 101 1 1 2 1 2 I 1 I 1 I 9 10 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

I During normal operation, routine surveillance revealed the failure of heat tracing I circuit 2B *(Panel* 8), Unit #1 suction piping to Boric Acid Transfer Pump, l-,CH-.P-2A.

[Q]::I) [This is a degraded mode of operation permitted by T.S. 3.3.B.5., and is r~portable as CQ:m I per T. S. 6. 6. 2. b. {2). Since the temperature of the affected lines was maintained as [§]]] I required, the redundant circuit was operable and two flow paths for boric acid to the I reactor were available, the health and safety of the public were not affected.

[ill] 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE [I0 Is IHI@ IE I@ ~@ IHIEIAITIEIRI@

~ ~.J@ 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT @ LER/RO CV ENT YEAR REPORT NO. CODE TYPE REPORT I 7 ! 9 j L=.I l O I 3 I 5 I I/I 10 j3 I L=J NUMBER 21 22 23 '.'4 26 27 28 29 30 31 ACTION FUTUR!: EFFECT SHUTDOWN {:u) ATTACHMENT NPRD-4 FORM SUB. PRIME COMP. SUPPLIER REVISION NO. 32 COMPONENT MANUFACTURER

+* 80 r~El@l~0 fo~ 0 1 ~LAI@ ~7~H1 0 I H 0 r 0 I sur+Tr@ 33 34 35 36 37 40 41 ~@ ~@) IC 1 2 1 6 1 8 I CAUSE DESCRIPTION AND CORRECTIV~ .A.CTJONS@

42 43 44 47 IA review of the he~t tracing circuit showed that failure was caused by water damage to ITJJ] l the heat tracing circuit. The corrective action implemented was to replace the heat [I]]] I tape and initiate a i!i2:intenance request to repair the water leak. ITEJ 7 8 9 FACILITY '3a' STATUS of POW::R OTHER STATUS METHOD OF A BO DI) LJ@ Oj O ! 0 J@ .... l _N_A ______ _. DISCOVERY DISCOVERY DESCRIPTION

'23, ~@ ... I __ Op_e_r_a_t_o_r_o_b_s_e_rv

__ a_t_i_o_n

_________

_. 7 8 9 10 12 13 ACTIVITY CONTENT Q\ RELEASED OF RELEASE AMOUNT OF ACTIVITY L!J@) ~§ ..... I __ NA ______ .....J 7 8 9 10 1i 45 46 44 80 NA LOCATION OF RELEASE@ 44 45 80 PERSONNEL EXPOSURES r:;;:;,. [iDJ I O N(oroJ@1TYIE1@

DESCRIPTIONA~

7 8 9 11 12 1-3--------------------------------------80 PERSONNEL INJURIES NUMBER DESCRIPTION 41 GJI1 I O I O I O I@ N. 7 8 9 11 ... 12------------------------------------------e'BO LOSS OF OR DAMAGE TO FACILITY @*3 TYPE DESCRIPTION CiliJ l:J@I NA 19/2. '&l/0$f?,, 1 a g ,~o:-----.~---~-----~---~-~-~--.::......L..1L.:e!~=-.3f_-=--=:--=-~-----~---

9~0 PUBLICITY Q ISSUED,,;;\

DESCRIPTION~

NRC USE ONLY "' l.BJ~~-N_A

___________________

__. I I I I I I I I I I I I I~ &:Q .::.a __ Ro,;;:

" .. e ATTACHMENT, PAGE 1 of 1 SURRY POWER STATION, UNIT NO. 1 DOCKET NO: 50-280 REPORT NO: 79-035/031-0 EVENT DATE: 11/27/79 TITLE OF REPORT: Low Current on Heat Tracing 1. DESCRIPTION OF EVENT: e With the unit in normal operation at rated power, operator surveillance found that Heat Tracing Circuit 2B (Panel 8) was operating at less than the current specified in the surveillance document.

Low temperature alarms were indicated.

Investigation for faulty heat tracing tape was initiated on the affected circuit. Faults were found on Circuit 2B (Panel 8) "2A" Boric Acid Transfer Pump suction and were identified as being the result of water penetration of the tape. The tape was replaced.

The circuit current was then verified to be within specs. of the surveillance document.

and a maintenance request ~ubmitted .to repair the leak. This is a degraded mode of operation permitted by T.S. 3.3.B.5 and is reportable in accordance with Technical Specification 6.6.2.b.(2).

2. PROBABLE CONSEQUENCES

• .\ND STATUS OF REDUNDANT SYSTEMS: At all times during the event, the temperature of the affected lines was maintained as required.

TI-le redundant circuit was operable.

Tnere were at all times two operable flow paths for boric acid to the reactor. Therefore, the health and safety of the general public were not affected.

3. CAITSE: The reduced currents were due to water penetration damage to the heat tracing tape on the affected circuit. 4. Iffi-LEDIATR CORRECTIVE ACTION: The heat tracing tape was replaced.

A maintenance request has been initiated to repair the leak. 5. SCF...EDDLED COR...~CTIVE ACTION: Tne uroblem was corrected immediately and no further action is required.

6. ACTION TAKEN TO PREVENT RECURRENCE:

Continuous surveillance is maintained on the Heat Tracing System. No additional action is considered necessary.

A task force has been assembled to investigate the replacement of existing tape with water resistant tape. This investigation is in progress.

7. GENERIC IMPLICATIONS:

This failure, as with others in the system, is c.onsidered randcfo( since no specific circuit has exhibited repeated failure.