ML20202F379
| ML20202F379 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 07/03/1986 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | Guldemond W, James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| CON-NRC-86-59 IEB-85-003, IEB-85-3, VPNPD-86-284, NUDOCS 8607150152 | |
| Download: ML20202F379 (5) | |
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Wisconsin Electnc eom couem 231 W. MICHIGAN, P.O. BOX 2046, MitWAUKEE, WI 53201 VPNPD-86-284 NRC-86-59 July 3, 1986 Mr. J. G. Keppler, Regional Administrator Office of Inspection and Enforcement, Region III U. S. NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, I)linois 60137 Attention:
Mr. W.
G.
Guldemand, Chief Reactor Projects Branch 2
Dear Mr. Keppler:
DOCKETS 50-266 AND 50-301 ADDITIONAL RESPONSE TO IE BULLETIN 85-03 MOTOR-OPERATED VALVE SWITCH SETTINGS POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 As requested in your June 3, 1986 letter, we are providing additional information to supplement our May 2, 1986 response to IE Bulletin 85-03.
The attachment to this letter describes in more detail how we plan to accomplish the recommendations.
If you have any additional questions on this information, please contact us.
Very truly yours, f
.t
(/ v, /h C. W.
Fa Vice President Nuclear Power Attachment Copy to Resident Inspector bOh 8607150152 860703 PDR ADOCK 05000266 G
PDR 3 5c 11
ATTACHMENT IE BULLETIN 85-03 PROGRAM PLAN The scope of this program consists of those motor-operated valves (Mov's) that are in the high-head safety injection system (high-pressure coolant injection) and the auxiliary feedwater system (emergency feedwater) and are required to be tested for operational readiness in accordance with 10 CFR 50.55a(g).
Only those MOV's that are required to change position to perform their safety function are included, and are only evaluated for that particular motion (i.e., open or close).
Safety injection system valves included are only those required for the high-head injection mode.
The following section provides (1) clarification on the results of Item (a) of the Bulletin (Table 1 of our May 2, 1986 response, attached) and (2) a more detailed description of the program to accomplish Items (b) through (d) of the Bulletin, including our proposed schedule for completion (Table 2 of our May 2, 1986 response, attached).
These sections are identified by the associated action Item (a) through Item (d) of IE Bulletin 85-03:
This item required the review and documentation of the a.
design basis for the operation of each valve at Point Beach that is in the scope of this Bulletin.
The design basis operation of each valve was obtained by using FSAR system descriptions, accident analyses, and operating procedures where necessary.
Using these sources, the direction that a valve must stroke to perform its safety function and the system conditions under which it will be operating (i.e., pressures) were determined.
The differential pressures (dP's) under which the valve may be operated were determined using the above sources, as well as Piping and Instrument Diagrams (P&ID's),
equipment layout drawings, and equipment specifications.
Worst case dP's were determined for these valves, using assumptions that are within the existing, approved design basis.
For example, auxiliary feedwater pump discharge valves were assumed to have a dP across them resulting from the auxiliary feedwater pump at shutoff head and the steam generator completely depressurized.
The dP's obtained were compared to the valve's design dP from vendor data sheets to ensure that the calculated dP is within the design dP.
Where applicable and within the design basis, valve alignments were assumed that resulted in the maximum dP.
The dP calculations were documented, reviewed, and approved in accordance with our Nuclear Engineering Administrative Manual.
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Attachment IE Bulletin 85-03 Program Plan Page 2 b.
This item requires establishing the correct switch settings using the results from, Item (a) above.
For the torque switches, this will be accomplished in two phases.
- First, the calculated dP's from Part (a) will be supplied to the valve vendor, along with the associated valve shop order numbers.
Stem thrusts will be calculated by the valve vendor for each valve.
These stem thrusts will then be given to Limitorque for determination of proper torque switch settings.
Limit switches will be set according to their design functions.
The full open limit switch will be set to allow the disc to coast to within 1/8" of the backseat, with visual verification of the stem position as a check.
The torque switch bypass limit switch will be set based on the full hammer blow travel, plus the lifting of the gate off the seat.
This will be visually verified by electrically opening the valve and ensuring that any torque switch movement takes place before the bypass switch opens, which indicates that the valve operator has undergone its normal maximum unseating torque.
Motor overloads will be sized according to operator nameplate current and manufacturer's recommended sizing, with conservatism towards valve operability.
c.
Item (c) outlines changing switch settings and testing.
Valve switch settings will be changed as appropriate.
Our previous submittal indicated that we could test 20 of 24 valves at, or near, their maximum dP.
During our Point Beach Unit 1 spring 1986 refueling outage, Operations tested all Unit 1 valves at, or near, the maximum dP.
All of these valves successfully cycled and were documented using plant maintenance work requests.
If switch adjustments are made, they will again be tested at, or near, the maximum dP.
d.
This item addresmes procedures to ensure that correct switch settings are determined and maintained throughout the life of the plant.
Switch settings are being determined by way of the above Items (a) and (b).
These settings will be incorporated into the plant maintenance instructions, along with the appropriate precedurcs for verifying them (see Item (b)].
In addition, the valves that are in the scope of this Bulletin are also part of the plant maintenance call-up system (periodic maintenance inspections).
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Table 1 IE Bulletin 85-03, Item a Results Point Beach Nuclear Plant, Units 1 and 2 Valva Tag No.
Desion-Basis Operation Maximum dP (PSIG)
Design dP (PSIG) l-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 I
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 tank.
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
~
2485 1617 1,2-878C if high head core deluge is deemed.
beneficial.
This function is not considered safety related.
1,2-4006; l-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, cnd do not use the motor operator to lift the plug off of the seat.
The motor operator in 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) direction.
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Table 2 IE Bulletin 85-03, Items b Through d, Schedule Point Beach Nuclear Plant, Units 1 and 2 Bulletin Item Description of Actions Estimated Date of Completion 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 test at or near maximim dP (if practical).
d Revise existing maintenance instructions, MAR 87 if necessary, to incorporate correct switch settings.
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