ML20081L770

Initial Part 21 Rept Re Anchor-Darling Check Valve Hinge Arms.Cs Pump B Discharge Check Valve Failed to Close in Nov 1994 Because Butt Stop on Hinge Arm Not of Sufficient Length.New Butt Stop Hinge Arm,Hinge Pin & Disc Installed

ML20081L770
Person / Time
Site:	Hope Creek
Issue date:	03/29/1995
From:	Thomson F Public Service Enterprise Group
To:	NRC
References
REF-PT21-95 NUDOCS 9503300325
Download: ML20081L770 (10)

Text

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03.29.1995 08:58 P.02

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INITIAL 10CFR21 NOTIFICATION ANCHOR-DARLING CHECK VALVE HINGE ARMS PUBLIC SERVICE ELECTRIC & GAS CO.

HOPE CREEK GENERATING STATION DOCKET NO. 50-354 Public Service Electric & Gas (PSE&G) has determined that a Substantial Safety Hazard could exist regarding the subject deficiency in accordance with the requirements of 10CFR21.

Therefore, PSE&G is reporting thic deficiency to the NRC in accordance with 10CFR21.

This Part 21 evaluation documents a deficiency in Anchor-Darling check valves due to incorrect dimensional tolerances of valve components. Specifically, 12" Core Spray Pump "B" discharge check valve (1BEV-015) failed to close during performance of curveillance procedure HC.OP-IS.BE-002 (Q) in November, 1994.

Inspection of the valve determined that the valve disc contacted the body in such a way as to pinch the disc, causing it to stick in the open position. The valve design includes a butt stop hinge e.o prevent the disc from contacting the valve body. Based on the inspection, it was determined that the butt stop on the hinge arm was not of sufficient length to contact the valve body j and prevent disc-to-body contact (See Enclosure 1 - valve cross- l cectional drawing). To correct the deficiency, a new butt stop hinge arm, hinge pin and disc were installed, and the valve was ,

cuccessfully retested in accordance with the surveillance test '

procedure.

As a result, PSE&G initiated inspections of Anchor-Darling check valves with a similar hinge style to determine if a generic deficiency exists. A total of fifteen (15) additional valves may be affected. On 1/19/95, 20" Safety Auxiliaries Cooling System (SACS) pump discharge check valve (1EGV-019) was inspected as a result of the Core Spray check valve failure corrective actions.

The inspection revealed that the valve disc was knocking against the valve body in two places with the valve in the open position.

The valva hinge arm and disc were replaced, and the new hinge arm was modiEled per the vendor instructions to build up material on the butt end.

The SACS check valve was equipped with the butt stop hinge design, and a small non-functional tail stop. This hinge was different from that shown on the design drawing which reflected a butt stop design only. The current design drawings for the sixteen (16) Anchor-Darling check valves reflect only the hi~nge butt stop design. Therefore, the small tail stop noted above was not consistent with the current design drawings.

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pp , . 03.29.1995 08

58' P.03 INITIAL 10CFR21 NOTIFICATION

?ECHOR-DARLING CHECK VALVE HINGE ARMS PUBLIC SERVICE ELECTRIC & GAS CO.

HOPE CREEK GENERATING STATION DOCKET NO. 50-354 PSE&G's evaluation of the check valves has determined that this issue is not considered an immediate operability concern for the following reasons: ,

- Only one previous Anchor-Darling check valve (Fuel Pool Cooling

& Cleanup (FPCC) Pump discharge check valve 1ECV-007) of similar design was found stuck in the open position due to the hinge butt pinching against the body. This occurred on three (3) separate occasions in 1988 and 1989. The final resolution was to grind the hinge butt. No problems to date have been identified since the corrective actions were completed.

- Successful completion of respective check valve surveillances, no other identified instances of disc-to-body contact, and overall history which demonstrates that the valves are not prone to failure.

- No disc pin failures have been identified. Our evaluation of this dimensional tolerance deficiency has revealed that fracturing of swing check valve disc pins has occurred in the industry. These have been attributed to the direct impact of the valve disc on the body during opening. Repeated occurrences of this impact due to operation and/or disc flutter have caused the disc pin failures. Anchor-Darling modified its swing check valve design by adding an extended hinge tail stop to absorb the impact during valve opening. (Refer to Enclosure 2 - Anchor-Darling product literature.) This modification addresses the potential disc pin failure concern. Anchor-Darling has recommended replacement of the older design. The disc pins that were removed from both the Core Spray Pump "B" check valve (1BEV- 015 ) and SACS Pump check valve (1EGV-019) were visually examined, and no disc pin defects;were identified.

An evaluation has determined that this specific Core Spray check valve failure would not have resulted in a Substantial Safety Hazard as defined in 10CFR21. The Core Spray check valve failure would have rendered one Core Spray loop inoperable. Should a single failure be considered concurrently in accordance with 10CFR21, both loops of the Core Spray system codld be' inoperable.

Page 2 of 4

FRON! .

03.29.1995 08:59 P.04 INITIAL 10CFR21 NOTIFICATION ANCHOR-DARLING CHECK VALVE HINGE ARMS PUBLIC SERVICE ELECTRIC & GAS CO.

HOPE CREEK GENERATING STATION DOCKET NO. 50-354 However, the design of the Emergency Core Cooling Systems (ECCS) would ensure that a sufficient combination of ECCS equipment (i.e., three (3) Low Pressure Coolant Injection (LPCI) loops and the Automatic Depressurization System (ADS)) would be available in the event of a Loss of Coolant Accident (LOCA) even if offsite power was not available (See Hope Creek UFSAR Subsection 6.3.1.1.2).

A list of the sixteen (16) Ancher-Darling check valves with the cimilar hinge arm design, which rely on the butt stop, is provided in Attachment 1. A review of selected additional hinge erms in storage showed either no tail stop or the non-functional older hinge arm tail stop. The hinge arm that contained a small non-functional tail stop appears to be part of the older design, c1though not reflected on the design drawings. These hinge arms rely on a butt stop to prevent disc to body contact.

PSE&G has concluded that the use of the older hinge arm design, which relies on the butt stop, may not preclude disc-to-body contact (as was the case with the Core Spray and SACS check valves). This may result in disc pin failure or the potential for the valves to stick in the open position. A failure of the SACS pump discharge check valves could affect the cooling water cupply to the Residual Heat Removal (RHR) Heat Exchangers, Control Room Emergency Filtration (CREF) chillers, Emergency Diesel Generators (EDG's) and EDG room coolers, Filtration Recirculation Ventilation System (FRVS) cooling coils, FPCC Heat Exchangers and the ECCS Pump Room coolers. A failure of the RHR Pump discharge check valves could affect Low Pressure coolant Injection following a LOCA and long-term decay heat removal capability post-accident. Based on the above, PSE&G has concluded that the existing hinge arms installed at Hope Creek are considered a Substantial Safety Hazard as defined by 10CFR21.

Therefore, this issue is reportable in accordance with 10CFR21.

Inspection of the remaining valves to determine if similar dimensional tolerance deficiencies exist, and replacement of the hinge arms with the extended tail stop design, is-being planned.

Design Change Package (DCP) 4HO-0916 will install the extended hinge arm design on the sixteen (16) affected valves. The estimated schedule for replacement work to begin is the 3rd Quarter of 1995 based on the results of the remaining Page 3 of 4 l

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• 03/29.1995 08:59- *

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• INITIAL 10CFR21 NOTIFICATION ANCHOR-DARLING CHECK VALVE HINGE ARMS PUBLIC SERVICE ELECTRIC & GAS CO.

HOPE CREEK. GENERATING STATION DOCKET NO. 50-354 w inspections.

This will allow sufficient time to prepare the DCP and obtain the necessary replacement parts. continued-

operability of the affected valves will be verified as follows:

1): ECCS pumps and associated discharge. check valves - Use of oither routine Quarterly Surveillance ~ tests (which evaluate cystem flows and idle. pump status) or by the ability'of the ECCS' Keep-Fill systems.to maintain downstream pressure when the' system.

ic not operating.

2) SACS pump discharge check valves - Use of either routine ~

Quarterly surveillance tests (which evaluate system-flows and idle pump status) during. routine system realignments.or via verification of appropriate flow values 3)

FPCCU system pump discharge check valves - Verification ,of epyropriate~ flow values during routine system realignments.

4)

FPCCU Filter-Demin Return to Torus valve - The safety functionL of this valve is limited to withstanding seismic events.  ;

Therefore, with the subject therefcilure is no functional mode. safety significance associated l

5) 1 of this.FPCCU valve Filter-Demin Outlet Isolation check valve - The failure.

does not constitute'a l

that: a) the failure mode Substantial Safety Hazard in i of concern-is readily detectable for the event upon which this valve's safety function is based, and' b) adequate compensatory measures exist to mitigate the safety function la based. consequences of this valve's failure for the event upon which,its If the above' failure, testing methodology identifies a new check valve ovaluated to ensure continued operability.the surveillance and/or verifi PSE&G will submit a written report within 30 days from the date of this notification.  !

Should you have any questions regarding this notification, please contact Mr. Dave Sinith at (609) 3h9-1282. .

F.

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. Thoms6n, Jr.

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-INITIAL 10CFR21 NOTIFICATION ANCHOR-DARLING CHECK VALVE HINGE ARMS-PUBLIC SERVICE ELECTRIC & GAS CO.

HOPE CREEK GENERATING STATION

, , DOCKET No. 50-354 ATTACHMENT 1 LIST OF AFFECTED ANCHOR-DARLING CHECK VALVES'

' SAFETY _RELATED SACS PUMP DISCHARGE CHECK VALVES (20", 150#).

.'1EGV-010 1EGV-013 1EGV-016 1EGV-019

-CORE SPRAY PUMP DISCHARGE CHECK VALVES (12", 300#)

1BEV-013 1BEV-014 1BEV-015 1BEV-016 RHR PUMP DISCHARGE CHECK VALVES (18",.300#)

1BCV-002 1BCV-008 1BCV-099 1BCV-102 FPCC PUMP DISCHARGE CHECK VALVES-(6",-150#)

1ECV-007 IECV-040 FPCC FILTER DEMIN OUTLET CHECK VALVE (8", 150#)

1ECV-015 NON-O SEISMIC FPCC FILTER DEMIN OUTLET RETURN TO TORUS CHECK V LVE (6", 150#)

~1EEV-007 l.

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FROM. * - 03.29.1995 09:00 P.08 t t N L LUS U N L 1 (cosr)

- PARTS LIST PART '

DESCRIPTION MATERIAL NO . - QTY.

WELD ENDS BODY SA216-WCB i1 1 I2 1 SEAT RING W/ STELLITE l SAIO6-B 3 1 DISC W/ STELLITE SA216-WCB 4 1 HINGE A216-WCB f 5 1 SET SCREW COMMERCIAL STEEL 6 1 HIllGE PIN A564 -630-1075 _

l 7 1 BONNET GASKET 2)* 22.k=y 30455 W/ ASBESTOS

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8 1 BONNET SA515-70 9 20 BONNET NUTS. SA194-2H 10 20 BONNET STUD 5 lE D1A. ~ SA193-87 11 1 HINGE SUPPORT A216-WCB 12 2 SUPPORT CAP 5 CREWS A574 14 2 ,

DOWEL PINS A108

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16 1 DISC WASHER STAINL55SSTEEL 17 1 DISC NUT .

A276-410T ,

18 1 DISC NUT PIN . STAINLESS STEEL 19 i SE.Tsc.REW . .-_

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1 LINLLUO U R U A -

SWING CHECK .

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Anchor / Darling's swing check valves provide the most economical reverse flow protection for normal applications.

STANDARD MOUNTING ALTERNATE MOUNTING j Wth body penetration. Leakage j

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is picvented by using a blind 1 O flange with spiral-wound gesket, j

$n l tTin, ,' rather than a pipe plug. l N OR C

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y {: a N Extended hinge. which takes up normal

% tiow Impact. Prevents disc contact with body.

• N2 codypenetration e Hinge mounted on pads.

read ty accese*ble for Lajustment and replacement. . (Tl I X \ \ \1 --

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Crowned sealmg surface

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ca nQ 90 at ght Igith inclined seat to provide assurance of closure even in l

minimst force, the absence of reverse flow.

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APPLICATIONS:

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• Where tight sealing is required. .  !

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• Where pressute drop must be kept to a minimum.

• Where water hammer occurrence does not present a problem. l p.

Scat Rings are seat welded to i

$N'hi$Y,in7agT,7#[

• Can be installed in horizontal as well as in vertical lines replacement. (with flow upward).

• Easy to maintain. .

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)WER REACTOR EVENT NUMBER: 28606 TCILITY: HOPE CREEK REGION: 1 NOTIFICATION DATE: 03/29/95 VIT: [1] [] [ ] STATE: NJ NOTIFICATION TIME: 08:57 [ET]

( TYPE: [1] GE-4 EVENT DATE: 03/29/95 EVENT TIME: 08:57[EST)

IC NOTIFIED BY: MALONE LAST UPDATE DATE: 03/29/95 2 OPS OFFICER: TIM McGINTY NOTIFICATIONS 4ERGENCY CLASS: NOT APPLICABLE

') CFR SECTION:

.0CC 21.21 UNSPECIFIED PARAGRAPH HAASS RVIB TIT SCRAM CODE RX CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE 1 N Y 100 POWER OPERATION 100 POWER OPERATION EVENT TEXT 1

PUBLIC SERVICE ELECTRIC AND GAS (PSE&G) PROVIDED A PART 21 EVALUATION  !

JOCUMENTING A DEFICIENCY IN ANCHOR-DARLING CHECK VALVES DUE TO INCORRECT l

-)IMENSIONAL TOLERANCES OF VALVE COMPONENTS.  !

3PECIFICALLY, THE 12" CORE SPRAY PUMP "B" DISCHARGE CHECK VALVE (1BEV-015)

? AILED TO CLOSE DURING PERFORMANCE OF A SURVEILLANCE PROCEDURE IN NOVEMBER, L994. INSPECTION OF THE VALVE DETERMINED THAT THE VALVE DISC CONTACTED THE

'IODY IN SUCH A WAY AS TO PINCH THE DISC, CAUSING IT TO STICK IN THE OPEN j

'?OSITION. THE VALVE DESIGN INCLUDES A BUTT STOP HINGE TO PREVENT THE DISC

? ROM CONTACTING THE VALVE BODY. BASED ON THE INSPECTION, IT WAS DETERMINED THAT THE BUTT STOP ON THE HINGE ARM WAS NOT OF SUFFICIENT LENGTH TO CONTACT CHE VALVE BODY AND PREVENT DISC-TO-BODY CONTACT. TO CORRECT THE JEFICIENCY, A NEW BUTT STOP HINGE ARM, HINGE PIN AND DISC WERE INSTALLED,

-\ND THE VALVE WAS SUCCESSFULLY RETESTED IN ACCORDANCE-WITH THE SURVEILLANCE TEST PROCEDURP.'

AS A RESULT, PSE&G INITIATED INSPECTIONS OF ANCHOR-DARLING CHECK VALVES fITH A SIMILAR HINGE STYLE TO DETERMINE IF A GENERIC DEFICIENCY EXISTS. A POTAL OF 15 ADDITIONAL VALVES MAY BE AFFECTED. PSE&G'S EVALUATION OF THE

,31ECK VALVES HAS DETERMINED THAT THIS ISSUE IS NOT COliSIDERED AN IMMEDIATE SPERABILITY CONCERN FOR SEVERAL REASONS. THE PART 21 SUBMITTAL PROVIDES

\DDITIONAL DETAILS REGARDING THE ADDITIONAL INSPECTIONS, OPERABILITY lIVALUATIONS, AND VERIFICATION OF CONTINUED OPERABILITY.

_. . . __ .- . ~ _

_ _ll .'s FAON .

, 03.29.1995 08:57 P . 01 -

Psao 0857 Date. h!) f[

Number of pages including cover shect:

7 h' "

3,,

7 NAC o PS CTR PSEfc7 A./C. W ASG.

Un re ocr.c OkE f Phone: Phone: ((0 09) 339 .f. 3d8 Fax phone: No1) BJ (,- 51 $_L Fax phone- IO28 [/o9)J c/

P MI8 s CC:

REMARKS: O ursent O Foryourreview C Reply ASAP O Please comment ft? A Y ).f /YO YflM7io&

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