ML20057E741

Forwards Response to GL 89-10,Suppl 5, Inaccuracy of MOV Diagnostic Equipment, W/Ref to Insp Rept 50-341/93-03 & in 93-054, MOV Actuator Thrust Verification Measured W/ Torque Thrust Cell & Strain Gauge

ML20057E741
Person / Time
Site:	Fermi
Issue date:	10/01/1993
From:	Gipson D DETROIT EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-93-0124, CON-NRC-93-124 GL-89-10, IEIN-93-054, IEIN-93-54, NUDOCS 9310130106
Download: ML20057E741 (5)

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,4 Douglas R. Gipson Sonot Wee hesen'

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October 1,1993 NRC-93-0124 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555

References:

1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43

2) Detroit Edison Letter to NRC, " Response to NRC Generic Letter 89--10," NRC-89-0274, dated ,

December 28, 1989

3) NRC Inspection Report No. 50-341/93003, dated March 30,1993

4) NRC Generic Letter 89-10, Supplement 5. " Inaccuracy t of Motor-operated Valve Diagnostic Equipment", dated June 28,1993

5) NRC Inf ormation Notice 93-54, " Motor Operated Valve .

Actuator Thrust Verification Measured with a Torque Thrust Cell and a Strain Gauge", dated July 20, 1993  ;

Subjact: Detroit Edison Response to NRC Generic Letter 89-10, j Supplement 5 The purpose of this letter is to provide Detroit Edison's re.sponse to NRC Generic Letter 89-10, Supplement 5 (Reference 4) . This supplement was issued to obtain information regarding the diagnostic equipment ,

being used for MOVs and actions to address their accuracy.

Accordingly, pursuant to the oath and affirmation requirements of 10 CFR 50.54(f), Detroit Edison has reviewed Generic Letter 89-10, Suppleme .t 5 and provides the information required under the

" Reporting Requirements" section of Supplement 5 in the Enclosure to this letter. As requested, a copy is also being submitted to the Regional Administrator U.S. Nuclear Regulatory Commission. Region III.

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October i. 1993 IIRC-93-0124 ,

Page 2 l If you have any questions, please contact Mr. Girija S. Shukla at  !

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USNRC October 1, 1993 NRC-93-0124 Page 3 j

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1. DOUGI.AS R. GIPSON, do hereby affirm that the foregoing l statccents are based on facts and circumstances which are true and j accurate to the best of my kncrwiedge and belief. l i

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D0f)GLAS'R. GIPSON Senior Vice President i i

On this [G day of d b 1993, before me personally appeared Douglas R. Gipson, being first duly sworn and says that he executed the foregoing as his free act and deed. i i

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1 Enclosure to NRC-93-0124 Page 1 Detroit Edison's Response to Generic Letter 89-10, supplement 5 (Inaccuracy of Mc. tor-Operated Valve Diagnostic Equipment)

Detroit Edison's detailed response to both items of the " Reporting Requirements" Section of GL 89-10, Supplement 5 is given below:

o NRC Item No. 1:

"Within 90 days of receipt of this letter, all licensees are required to notify the NRC staff of the diagnostic equipment used to confirm the proper size, or to establish settings, for HOVs within the scope of GL 89-10."

Detroit Edison Response:

In the response to NRC Generic Letter 89-10 (Reference 2),

Detroit Edison stated that at Fermi 2 HOVs were being tested by using Henze-HOVATS diagnostic equipment. Alsn, other industry available diagnostic testing methods were being considered for future use. Subsequently, Detroit Edison procured the VOTES diagnostic equipment in 1990 from Liberty Technologies. Since then Detroit Edison has been testing all the HOVs within the scope of GL 89-10 by using VOTES diagnostic equipment. Detroit Edison considers VOTES test results as a valid basis to confirm the proper size or to establish settings, for GL 89-10 HOVs.

In response to an NRC concern discussed during the Phase II Inspection of the Fermi 2 GL 89-10 Program (Reference 3), that a method to verify torque is not currently included in the VOTES testing, other industry available diagnostic testing methods such as ITI-H0VATe Torque Thrust Cell (TTC) are being considered *" r use with the V0TES system for measuring actuator output sque.

NRC Information Notice 93-54 (Reference 5) is being cat fully reviewed for evaluating the use of TTC at Fermi 2.

o NRC Item No. 2:

"Within 90 days of receipt of this letter, licensees are required to report whether they have taken actions or plan to take actions (including schedule and summary of actions taken or planned) to address the information on the accuracy of MOV diagnostic equipment."

Detroit Edison Response:

In response to VOTES 10 CFR Part 21 report issued by Liberty l Technologies in 1992, Detroit Edison completed the evaluation of test results for all GL 89-10 program HOVs tested to date with VOTES diagnostic equipment. The corrective actions resulting l

Enclosure to NRC-93-0124

, Page 2 from this evaluation are being implemented for applicable HOVs under the Fermi 2 MOV Program. The corrective actions will include; 1) retesting due to extrapolation error, 2) retesting of MOVs due to torque switch setting changes to reduce the over-thrust condition, and 3) performing structural analysis (eeak linx) for achieving a higher allowabJe thrust. All these corrective actions will be completed along with the Fermi 2 MOV Program schedule for GL 89-10. In addition, HOV diagnostic testing procedures have been revised to account for equipment inaccuracies in future testing.

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