ML20108C312

Final Deficiency Rept DER 84-24 Re Limitorque Valve Operators Found Loose on Valve Bodies.Initially Reported on 840501.Supplier Document Change Notices Issued to Manuals to Provide Addl Clarification Re Valve Position

ML20108C312
Person / Time
Site:	Palo Verde
Issue date:	10/23/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-30932-TDS, DER-84-24, NUDOCS 8411160500
Download: ML20108C312 (6)

Text

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Arizona Public Service Company 03 CCI 29 !J 11: 23 EC?i'iti? October 23, 1984 ANPP-30932-TDS/TRB U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria-Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. T. W. Bishop, Director Division of Reactor Saf ety and Pro'jects

Subject:

Final Report - DER 84-24 A 50.55(e) Reportable Condition Relating To Limitorque Valve ,

Operators Found Loose On Valve Bodies.

File: 84-019-026; D.4.33.2 Ref erence : A) Telephone Conversation between P. Narbut and T. Bradish on May 1, 1984 B) ANPP-29609, dated May 29,1984 (Interim Report)

C) ANPP-30258, dated August 16, 1984 (Interim Report)

D) ANPP-30537, dated September 17,1984 (Time Extension)

E) ANPP-30856, dated October 15,1984 (Time Extension)

Dear Sir:

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

Very truly yours,

. . CUL.A_. qw E. E. Van Brunt, Jr.

APS Vice President l Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment I

cc: See Page Two 8411160500 841023 ~

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'_. - Mr. T. W. Bishop DER 84-24 '

Page-Two ec: Richard De' Young, 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 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. Bloom D. N. Stover J. D. Houchen J. E. Kirby D. Canady Records Center i Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339 l

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FINAL REPORT - DER 84-24 DEFICIENCY EVALUATION 50.55(e)

ARIZONA PUBLIC SERVICE COMPA!E ( APS)

PVNGS UNIT 1 I. Description of Deficiency There have been several instances of Limitorque valve operators loosening f rom their Borg Warner valve bodies af ter the bolts securing them had been torqued and inspected. The following valves, which were supplied by Combustion Engineering (C-E), are documented on NCR SM-4407 as having loose bolts:

ITEM TAG NO. FUNCTION 1 IJSIAUV666 Containment Spray Pump A to RWT Isolation 2 IJSIBUV667 Containment Spray Pump B to RWT Isolation 3 1JSIBUV636 HPSI B Flow Control to RC Loop 1A 4 1JSIAUV637 HPSI A Flow Control to RC Loop 1A 5 1JSIBUV646 HPSI B Flow Control to RC Loop 1B 6 1JSIAUV647 HPSI A Flow Control to RC Loop 1B 7 1JSIAHV688 LPSI Pump A Isolation Evaluation During the preoperational testing of the Saf ety Injection (SI) system, actuator problems such as low phase current reading s, torque switch settings, and installed motors due to locked rotors had been encountered with SI system valve motors. These instances are documented in NCR SE-3994 and NCR SE-3967.

Per the disposition of these NCRs, the original motors were replaced with new actuators supplied by C-E. The work was implemented by Startup Work Authorization (SWA) 19752 for Items 1 and 2 and by SWA 19554 f or Items 3, 4, 5, and 6. Subsequent to the motor changeout, it was discovered that the valve operators were locse on Items 1 through 6.

Item 7 was not part of the operator changeouts documented in NCR SE-3994 and NCR SE-3967. SWA 20030 was issued to document and correct the loose bolts identified on Item 7 during normal startup tes ting.

The vendor instruction manual (Bechtel Log No. N001-11.04-263) for the 2-inch angle globe valves (Items 1 through 6) specifies that the valve be in the full open position when installing the Limitorque operator. The vendor instruction manual (Bechtel Log No.

N001-11.04-266) for the 10-inch gate valve (Item 7) states that the handwheel be rotated in the open direction until the operator reaches the valve yoke before the hex bolts are tightened.

y- 3. p Final Report-

. DER 84-24' Page Two Failure to adhere ' to the instructions described above could cause the valve motor operator hex bolts to be tightened with the force transf erred to the valve seat leaving the operator loose on the valve yoke. The probable cause of the loose Limitorque operators on Borg Warner valves is failure to properly follow the instruction manuals.

II. Analysis of Safety Implications Bechtel Engineering has reviewed .the deficiency and .has determined that, ~ 1f the valves were to operate with loose . bolts, their ability to perf onn- their- required saf ety function' would be uncertain, t

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Based on ' the above, this ' condition is evaluated as reportable under the requirements of 10CFR50.55(e); since, if these conditions were to remain uncorrected, it would represent a significant safety condition.

This project also has evaluated this condition as not reportable under 10CFR Part 21 since the subject valves have not been turned cver to operations.

III. Corrective Action Remedial Action:

An interim disposition was given to NCR SM-4407 to perf orm the following on the seven valves listed in Part I:

1. De-energize electrical power to the motor operator.

2. Operate valve to the fully open position.

3. Loosen hex bolts securing motor operator to valve yoke.

4. Re-torque valves per vendor manuals.

5. Re-energize electrical power to the motor operator and stroke the valve five times.

6. Check the torque on the hex bolts and report the results to E nginee ring.

The evaluation was performed via APS Startup Work Authorization

1. 23801 and Work Order 51634.

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Final' Report. ,

+ DER 84-24 Page ' Three !

The final torque check'af ter five strokes showed movement only on valve 1JSIAUV666 The movement was reported as very l alight and is considered'to be insignificant.- However, a second interim t disposition was given to NCR SM-4407 to confira.this by stroking the '

vale .(1JSIAUV666 only) five more times and checking the torque valt?es. This check confirmed that the torque values are acceptable.

In addition to the 7 valves identified as having icose bolts; there are 56 additional Borg Warner valves with Limitorque operators on i Unit 1. - Although^ no problems have .been identified with loose bolts on these valves, NCRs SM-4976, SM-4977, and SM-4978 have been j- initiated to ensure the 56 Unit 1 Limitorque operators not addressed ,

in NCR SM-4407 are properly fastened to their Borg Warner valves, j These NCRs have heen dispositioned as follows:

1. Verify the system is depressurized.

2.' Operate the valve to the mid position.

3. Set torque wrench to the low end of the range specified by the

vendor.

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4. Torque hex bolts per vendor manual.

i 5. Record bolt movement and submit to Engineering.

I Af ter reviewing these results, Engineering will determine if action j is required for Units 2 and 3.

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. Action to Preclude Recurrence

Supplier Document Change Notices (SDON) S01104 and S01105 have been issued to manuals N001-11.04-259-3 and N001-11.04-260-4,

respectively, to provide additional clarification regarding valve j position when tightening the operator bolts, i .Borg Warner instruction manuals N001-11.04-259-3 and N001-11.04-260-4 have similar instructions for installing 'Limitorque operators as

. those ref erenced above. SDCNs S01377 and S01376 have been issued to j provide valve position clarification in these aanuals.

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- To preclude recurrence of these deficiencies, the importance of-

-attention to detailo and proper implementation of DCPs have been

} included in training sessions for craf t and QC personnel. (Reference ,

{ B/ANP P-M-113212, dated March'30,-1984.) '

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• r 9' a n Final Report DER 84-24

-Page Four At present, Preventive Maintenance Procedures for all valve motor operators contain a section to inspect for any' loose bolting on the operator on the valve, and to submit a Corrective Maintenance Work Request (in accordance with 30AC-9ZZ01, Work Control) to correct identified deficiencies. 32MT-9ZZ47; Maintenance of Motor Operators, is picsently being revised. This' revision will include a section on inspection for loose parts,'especially bolts. It is felt that these actions provide sufficient control to track and repair / rework loose parts deficiencies on a routine basis, f

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