ML20198J458
| ML20198J458 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/27/1986 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-PT21-86-200-000 5211-86-2084, IEB-85-003, IEB-85-3, PT21-86-200, PT21-86-200-000, NUDOCS 8606030119 | |
| Download: ML20198J458 (4) | |
Text
I GPU Nuclear Corporation Nuclear
- =,ome::,r8o s
Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
May 27, 1986 5211-86-2084 i
Dr. Thomas E. Murley Region I, Regional Administrator U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Dr. Murley:
Three Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Initial Response to IE Bulletin 85-03 This letter represents the initial response to IE Bulletin 85-03 (Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings) for Three Mile Island Unit 1 (TMI-1).
For clarity, the GPUN response for each requested item follows the IEB format and is as follows:
a) Review and document the design basis for the operation of each valve 1.
The motor-operated valves in the high pressure coolant injection and emergency feedwater systems that are required to be tested for operational readiness in accordance with 10 CFR 50.55a(g) are:
High Pressure Injection (HPI) System MU-V-14 A, B - MU Pump Suction From BWST M'J-V-16 A, B, C & D - High Pressure Injection MU-V MU Pump Recirculation MU-V MU Pump Recirculation Steam Supply to Emergency Feedwater Turbine MS-V-2 A, B - Steam Dump Header Supply MS-V-10 A, B - EFW Pump Steam Supply 0606030119 860527 ADOCK 00000289 P,DR
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PDR 1
GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation f
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5211-86-2084 May 27, 1986 In addition, the following valves in the HPI and EFW System have motor operators but are locked closed and/or are not expected to operate in an emergency condition. Therefore, these valves are not considered to be within the scope of this bulletin.
MU-Y-12 (not expected to operate in an emergency condition)
EF-V-4, 5 (locked closed)
EF-Y-52, 53, 54, 55 (these valves are being changed to manual valves -
ref. letter 5211-86-2073 dated May 5,1986) 2.
Attachment I provides the design basis information for the above listed valves to be tested.
3.
The valve listings in Attachment 1 are subject to testing in accordance with our IST Program submitted in letter 5211-86-2010 dated 3
March 3, 1986.
b) Using the results from Item a above, establish the correct switch settings GPUN contracted Torrey Pines Technologies (TPT) to calculate the required thrust values for motor operated gate and globe valves. GPUN determined the required torque values for butterfly valves. M0 VATS (Motor Operated Valve Analysis and Test System) was used to determine the torque switch setting that provided the required thrust.
In addition, the bypass limit switch settings were verified or corrected using the M0 VATS test equipment.
The valves within the scope of this bulletin were tested during the SM Outage in April,1986 except for MS-V10A/B which were previously tested in 1984.
The current method used to size thermal overload heaters was reviewed and determined to be satisfactory.
The results of the above were reviewed and it was concluded that the as found conditions did not produce results which were determined to be reportable or made the valves inoperable, c)
Individual valve settings shall be changed, as appropriate, to those established in Item b above. Whether the valve setting is changed or not, the valve will be demonstrated to be operable by testing the valve at the maximum differential pressure determined in Item a above with the exception that testing motor-o)erated valves under conditions simulating a break in the line containing t1e valve is not required 1.
As previously stated, all valves have been M0 VATS tested and the settings were changed as necessary. The results of the testing are being reviewed for final acceptability and will be reported to the NRC according to the schedule listed below.
t i
r' 5211-86-2084 May 27, 1986 2.
GPUN has reviewed the IE Bulletin requirement to demonstrate the valve to be operable by testing the valve at the maximum differential pressure.
MU-V16A/8/C/D and MU-V36/37 are tested under conditions that simulate the differential pressure expected for an accident function (SP 1303-5.2 and SP 1303-11.8).
The Maintenance Department will be provided with minimum torque switch settings for each valve and will be instructed not to set the torque switch below the minimum value without Plant Engineering approval.
GPUN believes that the calculation and quantitative verification of the torque switch setpoint provides sufficient assurance that the valves will perform their safety function.
No special differential pressure testing is planned.
d) Prepare or revise procedures to ensure that correct switch settings are determined and maintained throughout the life of the plant GPUN is currently reviewing this item and will provide a response in accordance with the below listed schedule.
Schedule for Completing Above Lettered Items a) Complete with this submittal - Design basis reviewed / documented, b) Complete with this submittal - Set points established, c) Results of the testing will be forwarded by September 15, 1986, d) Procedures will be revised by March 1,1987. M0 VATS or equivalent system is anticipated to be utilized as appropriate.
Sumary This submittal meets the required written report within 180 days to report the results of Item A and the schedule to complete the remaining items.
GPUN will provide the remaining information in accordance with the previously stated schedule or advise accordingly.
Sincerely, H. D.
utill Director, TMI-1 HDH/DVH/spb:0580A Sworn and subscribedo dt before me this 27 day cc: Document Control Desk, NRC of T dAl
, 1986.
st!AR0!i P. BROWN, NOTARY Futuc gfp Attachment ML110WN E0RO. DAUPHIM CCUNTY NY COMu!3Sl0N EXPlats JUNE !!,1989 Itember, Pennsylvania Association of Notarles /
Notary Pu5, c
'p; ATTACHMENT I P;ge 1 cf 1 Max. Delta P Max. Delta P Valva Tag No.
Function Open Basis PSID Close Basis MU-V-14 A, B MU Pump Suction 35 Static Head from Max.
35 Same from BWST BWST Level = 76.5 f t. =
33.1 psi MU-V-16 A, B, C, D High Pressure 3112 MU Pump Shut-Off Head 3112 Same - Valves May Be Injection Plus Max. Suction Pressure Closed to Control in " Piggy Back" Mode =
Pressurizer Level 2900 + 212 = 3112 psig MU-V-36, 37 MU Pump Recire.
3112 MU Pump Shut-Off Head 3112 Same Plus Max. Suction Pressure in " Piggy Back" Mode =
2900 + 212 = 3112 psig MS-V-2 A, B Steam Dump Header' 1050 Design Pressure of System.
1050 Design Pressure of Supply Specifically Can be Used the System. Coul d to Open at System Pressure be Required to Close Following a Required During a Number of Closure During Transient System Transients Where the System May See Full Pressure (i.e. Line Break Downstream)
MS-V-10 A, B EFW Pump Steam 1050 Design Pressure of the 1050 Same Supply System Could be Used During Required Start /Stop of the System During Numerous Conditions