ML20106D543

Final Part 21/Deficiency Rept DER 84-48 Re Matl for Anchor Darling Pipe Plugs on Msiv.Initially Reported on 840724. Caused by Galling of Stainless Steel Expansion Plug Threads

ML20106D543
Person / Time
Site:	Palo Verde
Issue date:	10/18/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-PT21-84-494-000 ANPP-30903-TDS, DER-84-48, PT21-84-494, PT21-84-494-000, NUDOCS 8410260039
Download: ML20106D543 (5)

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Arizona Public Service Company 2 0CT 22 #1 D 51 i

October 18, 1984~

~ ANPP-30903-TDS/1RB REO!ON VIE U.. S. ' Nuclear Regulatory Commission.

Region V

-Creekside Oaks Office -Park

'1450 Maria Lane - Suite 210 Walnat Creek,. California 94596-5368 A'ttention: Mr. T. W. Bishop, D1' rector.

Division of Reactor Safety and Projects

Subject:

Final Report - DER 84-48 A 50.55(e) Reportable Condition Relating To Improper Material For Pipe Plugs On MSIV.

File: 84-019-026; D.4.33.2

-.Ref erence : A) Telephone Conversation between D. Hollenbach and T. Bradish on July 24,'1984' B) ANPP-30308, dated August 23,1984 (Interim Report)

C) ANPP-30567, dated _ September 19,1984 (Time Extension)

Dear Sir:

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

Very truly yours, t

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. C CLQ q tot p E. E. Van Brunt, Jr..

APS Vice President Nuclear Production ANPP Project Director 4

REVS /TRB/nj' Attachment-ces. See Page Two 4

8410260039 841018

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Mr. T. W. Bishop 1 DER.84-48 Page Two ec: '

.' Richard-DeYoung, Director Office' of Inspection and Enforcement U.- S. Nuclear Regulatory Commission Washington, D. C.

20555 T. - G. Woods, Jr.

D. B. Karner W. E. Ide~

D. B. Fasnacht A.. C. Rogers L. A._-Souza

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D. E. Fowler T. D. Shriver C. N. Russo J. Vorees J. R. Bynum J. M. Allen.

A. C. Gehr-W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher:

H. D. Foster D. R. Hawkinson

. R. P. Zimmerman.

L. Clyde M. Woods T. J. Bloou D. N. Stover-J. E. Houchen J. E. Kirby D. Canady

~ Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, GA 30339 7

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s FINAL REPORT - DER 84-48

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' DEFICIENCY EVALUATION 50.55(e)

ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNITS 1,. 2, 3 f

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Description of Deficiency The MSIVs and FWIVs are manuf accured and supplied. by ' Anchor / Darling

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Valve Company (A/DV). These valves (Ref erence Spec. No.13-MM-234A) are identified by tag numbers as follows:

Unit 1 Unit 2 Unit 3 MSIV 1-J-SGE-UV-170 2-J-SCE-UV-170 3-J-SGE-UV-170 1-J-SGE-UV-180 2-J-SGE-UV-180 3-J-SGE-UV-180 1-J-SGE-UV-171 2-J-SCE-UV-171 3-J-SG2-UV-171

'.1-J-S GE-UV-181 2-J-SGE-UV-181 3-J-SGE-UV-181 FWIV 1-J-SGA-UV-174' 2-J-SGA-UV-174 3-J-SGA-UV-174 1-J-SGA-UV-177 2-J-SGA-UV-177 3-J-SGA-UV-177 1-J-SGB-UV-132

'2-J-SGB-UV-132 3-J-SGB-UV-132 1-J-SGB-UV-137' 2-J-SGB-UV-137 3-J-SGB-UV-137 The hydraulic actuators for all.the above val' es are provided with v

NAMCO EA 180 Series limit switches supplied by A/DV..The limit

~ switches do not have discrete tag numbers. They are mounted on'the valve actuator yoke and provide valve position indication in.the control room. Additionally, these switches are wired in such a way thatstheir operation affects the status of the 4-way hydraulic pilot valves which control the MSIV. and FWIV open/close function.

- Each MSIV actuator has 6 : limit switches, 3 switches are for control of train "A" and 3 switches are for control of train "B".

Each set of 3 switches indicate full-closed (ZSL), full-open (ZSHH), and 90%

- open (ZSH).

The problem with NAMCO EA180.11mit switches was first documented in Nonconf ormance Report (NCR) ' SJ-4341. This NCR reports that several NAMCO EA180 Series limit switches on Unit 1 mainstream bypass and

' ' blowdown isolation valves were replaced because their actuating arms could not be tightened. On EA180 switches with certain speciic date codes, the expansion plug which is used to hold the actuating arm in place may be faulty. The NCR lists all of the Unit 1 Q-Class valves 4

which use this limit switch and need to be inspected for faulty expansion plugs. This DER was written to evaluate the deficiency of the limit switch expansion plug on the main steam isolation valves,

. which also use the EA180 limit switches.

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. DER 84-48; Page Two-n f

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bEvalhation-

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Thi switch actuating armiis mount'ed 'to the lever shaf t by a splined

_ fit.i tDuring installation' and setup', this fit is tightened and

secured by an-' expansion plug threaded into the end of the lever

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shaft.; Improper plugKinstallation can result in looseness at the 2

1 splined; fit._ This looseness would permit angular displacement between the arm and the lever shait with the possible result that

' the switch'would not'.perf orm its safety function of: indicating valve

. position in the control room and actuating the hydraulic -pilot valves which control-the MISVs and FWIVs.

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The root cause of the deficiency is galling of the stainless steel expnsion plug; threads which can prevent proper. Installation. -

.NAMCO, the switch manufacturer, has determined that EA180 Series.

. switches with date codes 1983,'2083,'2183, 2783, 2883, and'2983-

~(stamped on the conduit hub of the switch housing) mightibe susceptible to the-above. condition and has reported this condition to the. NRC. as-a possible deviatiion under 10CFR,Part 21.

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Series EA180 limit switches with other date codes'were manufactured with expansion plugs 'using a suitable coating to reduce installation

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friction and avoid galling.

j This generic condition with these particular' switches could also

' apply. to EA180 Series switches furnished with A/DV valves' on

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' Specification 13-FM-221B, Control Components, Inc. (CCI) valves on H'

- Specification ~ 13-J-601A, and C-E furnished valves under the NSSS i-

' contract.. Prior to delivery of-the 13-J-601A valves, CCI verified

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that the NAMCO limit switches furnish 3d in their scope of supply were fitted -with correct expansion plugs.

II.-

. Analysis of Safety Implications

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. Based on the above, this condition is evaluated as reportable under 1,t the requirements of 10CFR50.55(e); since, if this condition were to 4

4 remain uncorrected, it would represent a significant safety condition.

ic This project also has evaluated this condition as reportable under c

10CFR Part 21, and the supplier has filed a notification covering this deficiency.

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g, Final Report' DER 84-48 Page Three III.

Corrective Action The expansion plugs ;in the susceptible switches will be replaced with new stainless steel plugs with silver-coated threads. The silver prevents galling and permits proper plug installation.

Proper plug installation results in the required tight fit at the splined actuating arm to lev : shaft connection.

NCR SJ-4341 identifies all Unit 1 Q-Class valves which have NAMCO EA180 limit switches. These valves will be inspected to identify and correct those which have limit switches with the suspect date codes that require replacement of the expansion plugs. The NCR will be fully dispositioned prior to fuel load.

Investigative Request (IR) numbers 2S-IR-036 and 3C-IR-036 have been issued to implement walkdowns on Units 2 and 3 to identify and correct all NAMCO EA180 Series limit switches with the suspect date codes installed on Q-Class valves which require replacement of the expansion plugs.

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