ML20093P167

Rev 1 to Final Part 21 & Deficiency Rept Re Discrepancies W/ Anchor-Darling Msivs.Initially Reported on 830808.Larger Hydraulic Reservoir W/Baffles Installed in Each MSIV & Feedwater Isolation Valve

ML20093P167
Person / Time
Site:	Palo Verde
Issue date:	04/13/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-PT21-84-385-000 ANPP-29958-TDS, DER-83-56, PT21-84-385, PT21-84-385-000, NUDOCS 8408030048
Download: ML20093P167 (7)

Text

c IISCEIVED NBC Arizona Public Service Company Im JA i8 FM I: 05 REGt0tJ Vier April 13,1984 ANPP-29958-TDS/UtB U. S. Nuclear Regulatory Commission

• Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. T. W. Bishop,- Director Division of Resident Reactor Projects and Engineering Programa

Subject:

Final Report - Revision 1 - DER 83-56 A 50.55(e) Reportable Condition Relating to Discrepancies With Main Steam Isolation Valves by Anchor-Darling.

File: 84-019-026;.D.4.33.2

+

Reference:

A) Telephone Conversation between P. Narbut and R. Tucker on August 8, 1983 B) ANPP-27606, dated August 22,1983 (Interim Report)

C) ANPP-28319, dated November 30, 1983 (Time Extension)

D) ANPP-28863, dated February 14, 1984 (Time Extension)

E) ANPP-29029, dated March 8,1984 (Time Extension)

F) ANPP-29296, dated April 13, 1984 (Final Report)

Dear Sir:

Attached is Revision 1 to the Final written report of the Reportable Deficiency under 10CFR50.55(e), referenced above. This Revision restatesSection III, paragraph F, to accurately re flect the Corrective Action taken.

Very truly yourp Cc -

L L. CLLL NLL m E. E. Van Brunt, Jr.

APS Vice President, Nuclear ANPP Project Director EEVB/TRB: dim At tachinent cc: See Page Two 8408030048 840413 PDR ADOCK 05000528 S PDR Q ~,if g I

Mr. T. W. Bishop DIR 83-56 Page'Two cc: Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 T. G. Woods, Jr.

W. E. Ide D. B. Fasnacht A. C. Rogers B. S. Kaplan L. A. Souza J. Vorees J. R. Bynum P. P. Klute A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher H. D. Foster D. R. Hawkinson L. E. Vorderbrueggen G. A. Fiorelli S. R. Frost J. Self D. Canady Recorda Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339 i

I i

I

. _ . - - = . ,

l

+

l FINAL REPORT - REVISION 1 - DER 83-56

~ DEFICIENCY EVALUATION 50.55(e)

ARIZONA PUBLIC SERVICE COMPAhT (APS)

PVNGS UNITS 1, 2,

I. Description of Deficiency Specification 13-MM-234A specifies operability requirements for the Main Steam Isolation Valve (MSIV).

During the Unit 1 Hot Functional Testing Program, the project experienced considerable operational difficulties with the MSIV's supplied by the Anchor / Darling Valve Company (A/DVC). Repeated component' failures required rework and modifications on the hydraulic actuators in order to consission the valves for testing.

Similar hydraulic actuators are also supplied on the Feed Water Isolation Valve-(WIV) by Anchor / Darling. The problems range from safety considerations such as oil and ni trogen. leakage, to operability concerns such as valve float, and valve droop. The

. conditions are as follows:

A. Hydraulic Reservoir /011 Spray Hydraulic oil reservoir overflowen following dumping of accum-ulators during the accumulator charge test. This condition has been attributed to the surge of the hydraulic fluid being returned to the reservoir.

B. Nitrogen Leakage Excessive nitrogen leakage from nitrogen accumulators. This condition has been attributed to leaky fittings.

C. Hydraulic Pump Failures This condition has been attributed to inadequate material of j noneetallic parts of the pump.

D. F1uid (Fitting) Leakage Loss of hydraulic and instrument air pressure on the actu-ators. This condition was attributed to leaky fittings.

l l

l . __ __ _ _ _ _ , _ . _ _ _ . _ _ . _ , . __._. _ _ _ . _ _ _ - _ _ _ _ _ _ _ .

.. l l

- Final: Report - DER 83-56: l Page Two E. Valve Float' With equal pressure across the valve the MSIV and FWIV has the-potential to float open due - to fluid-pressure loss through the orifice to the cap end of the hydraulic cylinder.

F. Valve Droop With no pressure in the mainsteam line the MSIVs droop approx-imately one (1) inch after they trip the . full open limit switch. However, with L pressure in the main steam line, the MSIVs do not droop. The droop deactivates the position limit switch which disables slow mode operation and gives spurious intermediate indications.

G. NJ Accumulator Shutoff Valves Nitrogen accumulator shutoff supply valves did not meet environmental qualification requirements. . Nonmetallic parts in the valve are not rated for 120*F normal and 300*F accident temperatures at 5000 psig.

II. Analysis of Safety Implications The Main Steam Isolation Valves (MSIV) and the Feed Water Isola-tion Valves ' (FWIV) are normally open and are designed to fail closed during a Design Basis Event (DBE).

The analysis of safety implications for each point are as follows.

A. Hydraulic Reservoir /011 Spray 8

The hydraulic oil reservoir overflow condition does not impair the safety function of the valve to fast close in response to an MSIS signal. 'The spraying of hydraulic fluid in the 'sur -

( rounding area is an item of personnel safety.

B. Nitrogen Leakage Excessive nitrogen ir.akage into the atmosphere will reduce the stored energy available in the accumulator to close the valve thus impering the safety function of the MSIV/FWIV.

1-

~

i

$ *q ,

' Final Report - DER 83-56

--Page Three C. Hydraulic' Pump Failures This condition han been attributed to inadequate material of the nonmetallic L parts of the' pump internals. This ' condition if left. uncorrected would impair ~ safety function of the MSIV/FWIV.

D. Fluid (Fitting) Isakage Leaky hydraulic and -instrument' air fittings, if left uncorrec-ted, would impair . the 9afety - function due to insufficient hydraulic fluid and/or instrument air, required for operation of the valve.

E. Valve Float Since the valve floats open with equal ' pressure across the valve, -this condition would impair the safety function of the MSIV/FWIV.

! F. Valve Droop I Valve drooping was ohnerved at no pressure in the'line. Since there will always be pressure in the line during normal opera-tion, the valves will not droop. Hence this~ will not impair the the safety function of MSIV/FWIV.

G. Ng Accumulator Shutoff Valves

. This condition if left uncorrected would impair the safety function of the MSIV/FWIV.

A review of the above listed items reveals that all items, with the exception of Items A and F, would preclude the safety related functions of the hydraulic operators to ensure the isolation valves would fail-closed and maintain this position i during and after a design basis event.

Based on the above, this condition is evaluated as reportable undar the requirements of '10CFR50.55(e), since if this

,~

condition were to remain uncorrected, it would represent a significant safety condition.

The PVNGS also evaluates this condition as reportable under-the requirements of 10CFR21.21(h)(3), with the exception of subpart (vi), which requires the number and location of all other components supplied.

r

- . . _ . , . - , _ . . . _ _ . , ,. - ,_. . ,_-..mm ._,

C r., - ,

l

_ Final Report - DER 83 ~ Page Four.

t III. .Correetive Action A. Hydraulic Reservnir/011 Spray

'As per A/DV recogeendation, _ a larger hydraulic reservoir with -

baffles is being installed in; each MSIV. and -FWIV to preclude oil . spray. DCP 1SM-SG-103, 3SM-SG-103 and SCM-SG-103 for Units 1, 2 and 3 have been issued to perform this work prior to. fuel load for each unit.

B. ' Nitrogen Leakage Nitrogen _ leakage to atmosphere were restricted by minimizing the number of- fittings in the tubing. DCPs ISJ-SG-102, 2SJ-SG-102 and 3CJ-SG-102 have been . isaued to . perform this work for Units 1, 2 and 3 prior to fuel load for each unit.

C. Hydraulic Pump Failures Noneetallic components of the pumps were replaced by suitable material. as reconsended/specified by SC hydraulic (pump manu-facture).

Work for Unit 1 was carried out per SFR #1SG-165. Work on Units 2_and 3 will be implemented via DCPs 2SM and 3CM-SG-086 prior to fuel load for each unit.

D. Fluid (Fitting) Leakage Oil and air system fitting leakage has been corrected using Loctite 277 as a sealing agent, as 1,er A/DVC's recommenda-tion. Corrective action will be in accordance with Item B.

E. Valve Float A/DV recommended the installation of a relief valve in series with the orifice to prevent the valve from floating open. DCP 1SM-SG-103, 2SM-SG-103, 3CM-SG-103 for Units 1, 2 and 3 has been issued to perform this work on the MSIV and FWIV prior to fuel load for each unit.

W w y e rN% < v y **--e--T wme-- wy "re=, w--, wwv + &v w r3w -e --mr- yw w wr- - ww+- -v----o-ws---w----r-- e-e +r-+-w e -*--+

.,- - ' {

Final Report - DER 83-56 Page Five F. Valve Droop Valve droops, which causes conflicting valve position indications 'in the control room,- occurs only during

" slow mods" open/close operation so it is not safety-related.

In lieu of a physical change, a simple procedural change can eliminate the conflicting position indications in the control room. Whenever- one train gives an " intermediate" indication at the end of valve- travel, this 'will be corrected by operating the switch for that train until the intermediate indication clears. The vendor InstructioniManual No. E9023-9 has been revised to reflect this corrective action.

G. N9 Accumulator Shutoff Valve A/DV is providing valve kits to replace stem and stem packing -

at no cost. DCP 1SJ-SG-102, 2SJ-SG-102, 3CJ-SG-102 for Units 1, 2, and 3 has been issued to perform this work on the MSIV' and FWIV prior to fuel load for each unit.

H. General A seminar was arranged on February 28 and 29, 1984 at PVHGS ^

site to cover operation, maintenance and troubleshooting of the MSIV and FWIV hydraulic actuator.

I. NCRs SM-2968 and SM-3215 will be dispositioned in accordance

. with their respective DCPs.

J. A copy of this report will be sent to Anchor / Darling for their review under the requirements of 10CFR21.

4 l

t t

i 1

-)

- . - . - . _ . ,