ML18136A361

LER 79-038/03L-0:on 791214,two Manual Isolation Valves for Refueling Water Storage Tank Chemical Addition Tank Outlet Valve MOV-CS-102B Found Closed.Caused by Operator Procedural Error.Operators Instructed

ML18136A361
Person / Time
Site:	Surry
Issue date:	01/04/1980
From:	STEWART W L VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18136A360	List: ML18136A359 ML18136A361
References
LER-79-038-03L-01, LER-79-38-3L-1, NUDOCS 8001070450
Download: ML18136A361 (2)

Text

{{#Wiki_filter:-------~ . NRC FORM-366 ----------U.S. NUCLEAR REGULATORY COMMISSION (7a7.J. __ , ,. .CENSEE EVENT REPORT * .. CONTROL BLOCK: I 1 I IG) 6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) I v1 Al s1 Pl s1 1 101 ° I O I -I o I o I o I o I o I -Io I o 1014 11 11 11 I 1 101 I 10 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T [ITIJ 7 8 ~©I 0 1 5 1 °I O I O 1 2 1 8 I 0 101 11 21 t*1 41 71 9IG)I 01 11 01 41 sl olG) 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ I With Unit 1 at steady state operation, two nnnual isolation valves for the RWST I Chanical Addition Tank (CAT) outlet valve IVX)~-102B were fourrl to be closed. [[:ill Subsequent to the discovery of this con::lition, a test established the operability [[TI] I of the redurrlant CAT outlet valve, therefore the health am safety of the general [[II] I public were not affected. The event is reportable in accordance with Technical [[[TI I Specification

6. 6.~-~ b. 3. I I~ [§]]] 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE [ill] I sl 8 1@ ~@ L!J@ I z I z I z I z I z I z 18 L?J l!J@ 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT @ LER/RO CVENT YEAR REPORT NO: CODE TYPE REPORT I 7 J 9 J l.=.l l O I 3 1

• 8 1 J/1 I O I 3 I l£J. l=J NUMBER 21 22 23 24 26 27 28 29 30 31 ACTION FUTURE EFFECT SHUTDOWN r'22) ATTACHMENT NPAD-4 FOAM SUB. PRIME C.OMP. SUPPLI EA 80 REVISION NO. 32 COMPONENT MANUFACTURER TAK.ff: ACTl2N ON PLANT METHOD . HOURS SUBMITTED

~@L_j@ L.:J@ L:J I O I O I O I I ~@ 33 34 35 36 3 7 40 41 ~@ LI@ I z 19 19 19 I CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 42 43 44 47 [I12] I The discrepancy in valve al igrment was caused by an operator failirg to follow a ITTIJ I procedure that required the reopeni.rg of manual isolation valves for IDV-CS-102B OJI] I followi~ canpletion of a test. Operators have been explicitly reinstructed on um I the importance of perfonni.rg a periodic test in canplete conformance with the [I]3J I test document. 7 8 9 FACILITY STATUS % POWER OTHERSTATUS @ METHOD OF A 80 ITE] LI@ I 11 o, 01@11-N-JA ____ ___. DISCOVERY DISCOVERY DESCRIPTION ~@L..I _s_e_n_i_o_r_Re_a_c_t_o_r_Ope-=-_r_a_t_o_r_Ob_se_rv_a_t_i_o_n _ _. 8 9 10 12 11 ACTIVITY CONTENT REL~SED OF RELEASE AMOUNT OF ACTIVITY~ [QI] L:J@) ~@ .... I _NA ______ * ........ 7 8 9 10 11 44 7 45 46 80 44 NA LOCATION OF RELEASE@ 45 80 PERSONNEL EXPOSURES r:;;:;,. NUl;l.BEA. TYPE DESCRIPTION~ @TI I o I u I o Jl:J@L----~---------------------,-----' 7 8 9 11 12 13 BO PERSONNEL INJURIES ONU~BEA . DESCRIPTION 41 Ci:fil I I I O 1@1,._._ ________________________ 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY '4J'I TZE DESCAIP~ON 7 8 9 10 80 PUBLICITY Q <Jr-, NRC USE ONLY IS~EDQ DESC:&\_TION 8 0 Q l O 7 0 7 ..J O "' [ill] ~ei ..... l ---------------------:' II I I I II I II II I 7 8 9 10 68 69 80*0: NAME OF PREPARER __..w._. * ..__.T .... , .__.S.LJt_,,ew"""-"i:i'-'r .... t.__ ________ ___ PHONE =---+(~s~o"*-4)"3"'3~7== 3~1i,,:gj,,l,l4,-- __ 0 Q. "

• ~~~ATTaCHMENT:

--,--""'J St1rry Power ... Docket No.: Report No.: Event Date: Page 1 Station

• 50-280 79-038/03L-0

-12/14/79

• Title of Event: MOV-CS-l02B INOPERABLE DUE TO CLOSED MANUAL VALVES l-C.S-39 / 43 1. Description of Event: With Unit 1 at steady state operation, two manual isolation valves l-CS-39/43 for the RWST Chemical Addition Tank (CAT) outlet valve MOV-CS-102B were found to be closed during a plant walk-down by a Senior Reactor Operator.

The manual isolation valves had been closed for 38 hours. The event is reportable in accordance with Technical Specification

• 6.6.2.b.3.

2. Probable Consequences/Status of Redundant Systems: With MOV-CS-102B isolated, if the redundant parallel CAT outlet valve had failed to open upon the initiation of a CLS Hi Hi signal, sodium hydroxide could not have been added to the containment spray water in the correct proportion as water was pumped out of the *RWST by the con~ tainment spray pumps. Subsequent to the discovery of the closed manual valves l-CS-39/43, a test established the operability of the redundant CAT outlet valve, therefore the health and safety of the public were* not affected.

• 3. Cause: The discrepancy in valve alignment was caused by an operator failing to follow a procedure that required the reopening of manual isolation valves for MOV-CS-102B following the completion of a test. 4. Immediate Corrective Action: Upon the discove~y of the discrepancy in the manual isolation valves alignment, a performance test was conducted to prove the operability of the redundant CAT outlet valve had a CLS Hi Hi signal been initiated while MOV-CS-102B was isolated.

In conformance with the performance test, MOV-CS-102B was then unisolated.

5. Scheduled Corrective Action: Corrective action was taken upon the discovery of the event by conducting the performance test. This test proved the operability of the redundant CAT outlet valve and unisolated MOV-CS-102B, therefore no scheduled corrective action is required.

6. Action Taken to Prevent Recurrence:

To prevent recurrence of the event, operators have been explicitly instructed on the importance of performing periodic tests in complete conformance with the test document.

7. Generic Implications:

Since this event was caused by a single case of operator error in the performance of a test, there are no generic implications associated with this event.}}