ML20063P521

Final Deficiency Rept Re Low Pressure Safety Injection & Containment Spray Pump Casing hold-down Bolts under-torqued. Condition Determined Not Reportable Per 10CFR50.55(e)

ML20063P521
Person / Time
Site:	Palo Verde
Issue date:	09/29/1982
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, ANPP-21921-GHD, DER-82-35, NUDOCS 8210130495
Download: ML20063P521 (4)

Text

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50.55(o) Report '

l N N 6 @@N STA. 3003 P.o. box 21666 - PHOENIX ARIZONA 85036 September 29, 1982 ANPP-21921-CHD/BSK I

l U. S. Nuclear Regulatory Commission l Region V ,

Creekside Oaks Office Park' l 1450 Maria Lane - Suite 210 l Walnut Creek, California 94596-5368 Attention: Mr. D. M. Stcrnberg, Chief Reactor Projects Branch 1

Subject:

. Final Report - DER 82-35 A 50.55(e) Report Relating to Unit 2 LPS1 and Containment Spray Pump Casing Hold-Down Bolts Under-Torqued File: 82-019-026; D.4.33.2

Reference:

(A) Telephone Conversation between J. Eckhardt and ,

G. Duckworth on July 7, 1982 (B) ANPP-21557, dated August 5, 1982 (Interim Report)

Dear Sir:

Attached is our final written report of the deficiency referenced above, which has been determined to be Not Reportable under the requirements of 10CFR50.55(e).

Very truly yours, J

CRC %LL E. E. Van Brunt, Jr.

APS Vice President Nuclear Projects Management ANPP Project Director EEVBJr/GHD:db Attachment cc: See Attached Page 2 t

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U. S. Nuclear Regulatory Commission September 29, 1982 Att'ention: Mr. D. M. Sternberg, Chief

. .ANPP-21921-CHD/BSK Page 2 cc: Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 T. G. Woods, Jr.

J. A. Roedel D. B. Fasnacht G. C. Andognini A. C. Rogers B. S. Kaplan W..E. Ide

.J. Vorees J. A. Brand A. C. Gehr W. J. Stubblefield W. G.. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen G. A. Fiorelli Lynne Bernabei, Esq.

Harmon & Weiss 1725 "I" Street, NW Suite 506 Washington, D. C. 20006 R. L. Greenfield Assistant Attorney General-Bataan Memorial Building Santa Fe, New Mexico 87503 l

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FINAL REPORT - DER 82-35 Y

DEFICIENCY EVALUATION 50.55(e)'

-ARIZONA PUBLIC SERVICE COMPANY (APS) 4 PVNGS UNIT 2 I.- DESCRIPTION OF DEFICIENCY Ingersoll-Rand's instruction manual specifies a 4,000 ft.-lbs. torque value for the Low Pressure Safety Injection -(LPSI) and . Containment Spray Pumps hold down bolts. During the conduct of rework of the-LPSI "B" Pump (087641) and Containment Spray "B" Pump (S/N 087645) per requirements of NCR NA-080, a hydraulic torque wrench (direct read-out) was utilized to remove the nuts, revealing that the break-away-torque was 2,500 ft.-lbs. This DER was initiated to evaluate the condition, since the original application of tightening torque was done utilizing a field fabricated wrench, and may not have provided 4

the necessary accuracy.

It is Engineering's position that the 2,500 ft.lb. torque value was-not an accurate measure of the original tightening torque. This position is based on the following findings:

1. Per references (1) and (2) the amount of torque 1 required to start

, disassembly of an axially loaded fastener-is called the break loose torque, and is less than the torque required to tighten.

In reference (2), Power and Engineered Products Company (PEPCO)-

performed tests to determine the torque required for disassembly of coated (lubricant) and uncoated bolts. For the lubricated bolts the break loose torque. varied between fifty-three (53) and Sixty-five (65) percent of the original tightening torque.

Similarly, the uncoated samples varied between seventy-three (73) and seventy-eight (78) percent. The Ingersoll Rand Installation Manual (Reference 3) calls for the application of a' lubricant to the bolts to prevent galling.

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2. Additionally, there is a drop in bolt tension versus time. This condition is known as relaxation resulting from.the elastic re-covery which takes place when the_ torque wrench is removed.

(Torsional stresses go-to zero). Secondly, creep and yielding-in the bolt due to the high stress level at the root of the

- threads results in further relaxation over time. Therefore,.the break loose torque is not an accurate method for measuring-the original hold down' torque. Dependent on many factors, the break loose may vary between fifty (50 ) and seventy-five-(75) percent

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of the assembly torque. A 2,500 ft.-lb. or 62.5 percent' dis-assembly torque for the LPSI pump casing bolts falls within this range.

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.c:,,g Final Re' port - DER 82-35 Page 2

, 'II. ANALYSIS OF-SAFETY IMPLICATIONS i~

APS'and Bechtel Engineering have evaluated the torque value recorded during the rework of the LPSI "B" pump, and conclude that this condition is not reportable under the requirements of 10CFR50.55(e). The observed value of break loose torque is indicative of an original hold down torque in compliance with the specification requirement.

III. CORRECTIVE ACTION ,

'A copy of this DERIwill be routed to.the responsible field engineers to assure understanding of the methodology used in verifying fastener

-torque values. In the future, field personnel will verify a torque ,

value by. recording the additional tightening value rather than the 3: break loose value.

, REFERENCES

1. "Helpfdl Hints for Fastener Design and Application", Russell, l Burdsall, Ward Corporation.

2. " Report from G. P. Miller to J. Stravinkas", Power and Engineered Products Company, Incorporated, June 21, 1982.

3. Instruction Manual for LPSI Pumps, Ingersoll-Rand Bechtel Log No. N001-9.02-1.

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