ML20083P945

Final Deficiency & Part 21 Rept DER 83-56 Re Discrepancies w/Anchor-Darling Msivs.Initially Reported on 830808.Larger Hydraulic Reservoir W/Baffles Being Installed to Preclude Oil spray.Anchor-Darling Reviewing Discrepancies

ML20083P945
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-PT21-84-222-000 ANPP-29296-BSK, DER-83-56, PT21-84-222, PT21-84-222-000, NUDOCS 8404200274
Download: ML20083P945 (7)

Text

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h' Arizona Public Service Company 9 498 6V April 13, 1984 1

ANPP- 29296 -BSK/TRB 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 Programs

Subject:

Final Report - 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)

Dear Sir:

Attached is our final written report of the Reportable Deficiency under 10CFR50.55(e), referenced above.

Very truly urs,

{

. Ch A E. E. Van Brunt, Jr.

APS Vice President, Nuclear ANPP Project Director EEVB/TRB dle Attachment .f m ,w cc: See Page Two L, , :{ ;'] dI_23 C ea

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Mr. T. W. Bishop DER 83 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. Fiore111 i S. R. Frost

! J. Self l D. Canady i

Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 l Atlanta, CA 30339 l

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FINAL REPORT - DER 83-56 DEFICIENCY EVALUATION 50.55(e)

ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNITS 1, 2, 3 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 commission the valves for testing.

Similar hydraulic actuators are also supplied on the Feed Water Isolation Valve (FWIV) by Anchor / Darling. The problems range from -

safety considerations such as oil and nitrogen leakage, to

'c1 operability concerns such as valve float, and valve droop. The 1 conditions are as follows: .

A. Hydraulic Reservoir / Oil Spray -

Hydraulic oil reservoir overflowed 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 ' .gb, Excessive nitrogen leakage from nitrogen accumulators. This~ \

condition has been attributed to leaky fittings. ( ,

A C. Hydraulic Pump Failures \

This condition has been attributed to inadequate material of'i nonmetallic parts of the pump.

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

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Final Report - DER 83-56 G Page Two (-

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1 E. Valve Fidat s " N, h w

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With equal pressure across the valve the MSIV and FWIV has the i s potent!ial to float open due to fluid pressure loss through the orif.\e M to th.e cap end of the hydraulic cylinder.

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, s. ' " With no\ pressure in the mainsteam line the MSIVs droop approx-

>I C ,, imattely one (1) inch after they, trip the full open limit

%C-switch. Qowever, with pressure in the main steam line, the D E 's > +s MSIVs do not droop. The droop 1deact'ivates the position limit

'\ switih wl.ictr disables slow mode , operation and gives spuricus intehnediatgindications. [

- G. 'Nj Acetimulator Shutoff Valves

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Nilrogen. accumulator shutoff supply valves did not meet environmental qualification requirements. Nonmetallic parts 3 in'tt:e valve are not ' rated for 120*F. normal '

and 300*F accident

% temperature 2'at 5000 psig.

? II. Analysis of Safety Implications -

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The Main Steam Isolation Valves (MSIV) 'and' th'e Feed Water Isola-tion Vafves (FWIV) - are normally open and are designed to fait closed during a De'hign Basis Event (DBE) e i s s' \. A g  :,a As The analysis of .safet implicatioq y

lor'ecch s point are as follows.

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The hpdra(ul'ic oil reservoir kvprfloy condition does not impair og safyy function "of the valve go,fdst close in response to g

e in 1EIS signal. The spraying sof by nutic fluid in the sur-w' rounding area is an item of persorir.;1('shfety.

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'* B. Nitrogen Leakage

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'N3 Exces'bive nitrogen leaka' g e into the at'psphere c will reduce the s

etored ' energy available in the accumuldter to close the valve

'thus imparing the .safety 3

..- fu(ctiqn of the M31V/FWIV.

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Final Report - DER 83-56 Page Three C. Hydraulic Pump Failures

, ,d This condition has been attributed to inadequate material of the nonmetallic parts of the pump internals. This condition if left uncorrected would impair safety function of the MSIV/FWIV.

D. Fluid (Fitting) Leakage Leaky hydraulic and instrument air fittings, if left uncorree-ted, would impair the safety 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 j valve, this condition would impair the safety function of the MSIV/FWIV.

F. Valve Droop Valve drooping was observed 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. y N 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, .vould preclude the . safety .

related functions - of tha hydraulic operators - to ensuren the isolation . valves would fail-closed 'and maintain this : position during and after a design basis event.

4 Based . on the above, . this condition 'is '- evaluated as . reportable ,

under .the requirements of 10CFR50.55(e), 'since ' ! f ' : this ..

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

The PVNGS also. evaluates I this' condition "as reportable ; under -

the requirements 'of l10CFR21.21(b)(3)', with -the ' exceptionc of

subpart (vi), which requires the number and lo' cation i of - ~all other components supplied.-

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Final Report - DER 83-56 L' age Four 4 _-

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III. Corrective Action A. Hydraulic Reservoir / Oil Spray i

As per 'A/DV recommendation, a larger hydraulic reservoir with baffles is being installed in each MSIV and FWIV to preclude oil spray. DCP ISM-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 issued to perform this work for Units 1, 2 and 3 prior to fuel load for each unit.

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

Work for Unit - I 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 i Loctice 277 as a sealing agent, as per 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 rnd 3 has been issued to perform this work on the MSIV and FWIV prior to fuel load for each unit.

F. Valve Droop Valve droop only occurs in the slow mode open/close operation with no pressure in the main steam line. Since the slow mode operation is not'a safety-related function, and in lieu of a j physical change, the operator's procedure for oepration of the

! MSIV switches for the slow mode operation has been revised as l

follows:

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Final Report - DER 83-56 Page Five

" Operate the switch of the train to be tested. At the end of valve travel, if the other train shows a intermediate indication, operate the switch for that train until the intermediate indication clears".

G. NJ Accumulator Shutoff Valve A/DV is providing valve kits .to replace stem and stem packing at no cost. DCP ISJ-SG-102, 2 SJ-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 PVNGS 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.

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