ML20203P875
| ML20203P875 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 05/02/1986 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| CON-NRC-86-37 IEB-85-003, IEB-85-3, VPNPD-86-192, NUDOCS 8605080284 | |
| Download: ML20203P875 (4) | |
Text
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l%sconsin Electnc romcoem 231 W. MICHIGAN. P.O. BOX 2046. MILWAUKEE, WI 53201 VPNPD-86-192 NRC-86-37 May 2, 1986 Mr. J.
G. Keppler, Regional Administrator Office of Inspection and Enforcement, Region III U. S. NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
DOCKET NOS. 50-266 AND 50-301 55SPONSE TO IE BULLETIN NO. 85-03 MOTOR-OPERATED VALVE SWITCH SETTINGS POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 IE Bulletin No. 85-03, " Motor-Operated Valve Common Mode Failure During Plant Transients Due To Improper Switch settings", was issued on November 15, 1985 to inform licensees of a potential problem involving the operability of motor-operated valves as a result of imprcper switch settings.
The bulletin requested licensees to develop and unplement a program to ensure that switch settings on certain safety-related motor-operated valves are selected, set, and maintained correctly to accommodate the maximum dif ferential pressures expected on these valves during both normal and abnormal events within the design basis.
The bulletin requires,in Action Item e that a written report be submitted to the NRC by May 14, 1986 that:
(1) documents the design basis for the operation of certain motor-operated valves in the high pressure coolant injection and emergency feedwater systems (Bulletin Action Item a) and (2) contains the program and schedule to ensure the valve operator switches are selected, set, tested, and maintained properly (Bulletin Action Items b through d).
Only motor-operated valves in the high head safety injection and auxiliary feedwater systems, which are required to be tested for operational readiness in accordance with 10 CFR 50. 55a (g), were included.
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PDR ADDCK 05000266 (
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4 Mr. J. G. Keppler May 2, 1986 Page 2 The results of th.is review are provided on Table 1 (attached),
and include a brief description of the valve's design-basis safety function,.the maximum differential pressure expected, and the design differential pressure from the original valve data sheets.
Table 2 (attached) outlines the schedule to meet Bulletin Action _ Items b through d.
If you have any questions concerning our response to this bulletin, please contact us.
Very truly yours, V
[U[
C. W. ray Vice President
. Nuclear Power Attachments Copies to NRC Document Control Desk, Washington, D. C.
(with original)
NRC Resident Inspector Subscribed and sworn to before me this ofad day of May 1986.
N1 / > / SAM [Ab N6tary Publid, ~SgEtt# of Wisconsin My Commission expires //la 49 ///K ~
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4 e
Table 1-IE Bulletin 85-03, Item a Results Point Beach Nuclear Plant, Units 1 and 2 Valve Tag No.
Design-Basis Operation Maximum dP (PSIG)
Design dP'(PSIG) 1-4020; l-4021; Must be able to close to isolate auxiliary 1305
'1560 1-4022; l-4023 feedwater flow from the motor-driven auxiliary feedwater pumps to the steam generators of'the unaffected unit.
This ensures full auxiliary feedwater flow to the affected unit.
1,2-2019; Must open to admit steam to the turbine-1085*
1085 1,2-2020 driven auxiliary feedwater pump.
1,2-825A; Opens to provide suction to the high 30 150 1,2-825B head safety injection pumps from the refueling water storage tcnk.
1,2-826B; Opens to provide suction to the high 12 200 1,2-826C head safety injection pumps from the boric acid tank.
1,2-878A; To be opened at the operators discretion 1617 2485 1,2-878C if high head core deluge is deemed beneficial.
This function is not considered safety related.
1,2-4006; 1-4009; Opens to provide service water to the 76 150 1-4016 suction of the auxiliary feedwater pumps.
- These valves are of the globe, stop-check type that only open on differential pressure, and do not use the motor operator.to lift the plug off of the seat.
The motor operator is only used to close the valve, or hold it in a closed position.
Therefore, the differential pressure will not affect the stem thrust for the opening (safety-related) l direction.
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04/30/86 i
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g Table 2 IE Bulletin 85-03, Items b Through d, Schedule l
Point Beach Nuclear Plant, Units 1 and 2 l
l Bulletin Itgm Description of Actions Estimated Date of Completion l
b Document existing switch settings, stroke Unit 1:
JUN 86 test most valves at or near maximum dP.
Unit 2:
DEC 86 (20 out of.24 can be tested as such),
and stroke test other valves (4 out of 24).
b Establish correct switch settings by JAN.87 supplying vendors with maximum dP's.
c Change valve settings, if necessary, to Unit 1:
JUN 87 those determined by part b, and' stroke Unit 2:
NOV 87 l
test at or near maximim dP (if practical).
d Revise existing maintenance instructions, MAR 87 if necessary, to incorporate correct switch settings.
04/30/86