ML20024H958
| ML20024H958 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 08/20/1993 |
| From: | Wright G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Antony D NORTHERN STATES POWER CO. |
| References | |
| GL-89-10, NUDOCS 9308310025 | |
| Download: ML20024H958 (4) | |
Text
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NUCLEAR REGULATORY COMMisslON f
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g 799 ROOSEVELT RO AD CLEN ELLYN, ILLINOl$ 60137 AUG 2 01333 l
Docket No. 50-282 Docket No. 50-306 Northern States Power Company ATTN: Mr. D. D. Antony Vice President, Nuclear Generation 414 Nicollet Mall
)
Minneapolis, MN 55401
Dear Mr. Antony:
i
SUBJECT:
DOCUMENTATION REQUEST TO SUPPORT THE PRAIRIE ISLAND MOTOR OPERATED VALVE INSPECTION j
l would like to inform you of our intent to perform a Generic Letter (GL)
I 89-10 motor operated valve (MOV) inspection, scheduled for September 27 i
through October 8, 1993.
This will be a Part 2 inspection in accordance with NRC Temporary Instruction 2515/109, Revision 1.
The main focus of our inspection will be the implementation of your GL 89-10 program.
Specifically, we will review your evaluation of differential pressure test results and the use of available data to justify assumptions and update your program.
We will also review the status of issues raised during the Part 1 inspection (Reports No. 50-282/91023(DRS); No. 50-306/91023(DRS)).
For your information, Attachments 1 and 2 list items that are normally used to support the inspection.
To improve the inspection's effectiveness, I request your assistance in sending us the information listed in Attachment 1 by September 16, 1993, and in having the information listed in Attachment 2 available for review at the beginning of the inspection.
To further enhance information exchange, we would appreciate an informal presentation on your GL 1
89-10 MOV program status following the entrance meeting.
If you have any questions regarding Attachments 1 and 2 or the inspection itself, please contact me or Ms. Christine Gainty of my staff at (708) 790-5695 or (708) 790-5628, respectively.
Sincerely,
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G. C. Wright, Chief Engineering Branch l
Attachments:
As stated j
l See Attached Distribution l
9308310025 930820 PDR ADOCK 05000282 G
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Northern States Power Company.
2 74,G 2 0 1993 l
Distribution l
cc w/ attachments:
E. L. Watzl, Site Manager Prairie Island Site M. Wadley, Plant Manager OC/LFDCB T. Scarbrough, NRR Resident Inspector, RIII 6
Prairie Island Resident Inspector, RIII Monticello John W. Ferman, Ph.D.,
Nuclear Engineer MPCA Kris Sanda, commi sioner s
Minnesota Dept. of Public Service Prairie Island LPM, NRR Robert M. Thompson, Administrator Wisconsin Division of Emergency Government 1
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ATTACHMENT 1 PRAIRIE ISLAND GENERIC LETTER 89-10 MOV INSPECTION DOCUMENTS FOR NRC REVIEW i
Please send copies of the following documents /information prior to September 16,.1993 i
1.
Overall GL 89-10 program description document-(including the scope of MOVs in the program) 2.
Information on all MOVs in the program, indicating:
- which have been dp-tested for GL 89-10
- which have been static-tested
- which are planned for modifications prior to close out per GL 89-10 (indicate type of mod planned)
- size and type (gate, parallel gate, globe, butterfly, etc.) for each valve
- plans for grouping (include i
justification)
- schedule for future outages and planned dp and static testing 3.
For each MOV that has been dyr amically tested, provide the following:
- test dp and design basis dp l
- valve factor, stem friction coefficient-during static and dynamic test, thrust observed at torque switch trip under static and dynamic conditions, and percentage of load l
sensitive behavior observed
- design basis conditions - differential pressure, system l
pressure, worst case motor voltage, fluid temperature and flow i
conditions, and ambient accident temperature conditions I
- valve information - manufacturer, type, pressure rating, disc area used in calculations, stem diameter, assumed valve factor, assumed stem friction coefficient, pitch, lead i
- actuator - manuf acturer, type, size, overall gear ratio, application factor, assumed efficiencies
- motor - at or dc, nominal voltage rating, nominal tcrque, speed 4.
List of documents identifying MOV failures, such as DRs and i
nonconformance reports - last 2 years - include valve number, date and short description Please send the information to:
USNRC, REGION III I
ATTENTION: CHRISTINE GAINTY, DRS 799 ROOSEVELT ROAD I
GLEN ELLYN, ILLINDIS 60137 l
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ATTACHMENT-2 i
PRAIRIE ISLAND GENERIC LETTER 89-10 MOV INSPECTION t
DOCUMENTS FOR NRC REVIEW Please have the following documents /information available on site at the start i
of the inspection L
1.
Procedures for:
1
- Performing design basis reviews
- Performing calculations for required thrust / torque
- Thermal overload selection
- Post maintenance testing on MOVs
- Evaluation of MOV capability
- Performing degraded voltage calculations i
- Control of switch settings
- Evaluation of MOV test results (static and dp)
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2.
Plans for Periodic Verification i
3.
Plans for use of diagnostic test equipment, including l
manufacturer, devices used, and assumed accuracies 4.
P& ids, Technical Specifications.
5.
Self-assessments of GL 89-10 program.
r 6.
Actions taken to address various information notices to prevent pressure locking and thermal binding of gate valves.
1 1
7.
Specific steps taken to address the Limitorque Part 21 Notice, 7
" Torque at Elevated Temperatures," dated May 13, 1993.
8.
Schedule showing completion projections for GL 89-10 commitments.
f 9.
Actions taken to address the commitments, weaknesses and other issues identified in Part 1 inspection report (50-282/91023; 50-306/91023).
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10.
Steps taken to justify generic assumptions for valve factors, stem
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friction coefficients under degraded and non-degraded lubricant conditions, and load sensitive behavior.
11.
Steps taken to feedback test information into your GL 89-10
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program. Specifically, steps taken to make programmatic adjustments for valve factors, stem friction coefficients, and l
load sensitive behavior based on the results of your testing program.
1 12.
Specific justification for not performing dynamic testing on MOVs.
included in the program.
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'i 13.
An organization chart for the MOV staff and the appropriate phone numbers.
i 14.
MOV maintenance activities to be performed during the inspection.
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