ML19291B914
| ML19291B914 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 12/07/1979 |
| From: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| To: | Harold Denton, Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578 TAC-30686, TAC-30687, TAC-30690, TAC-30691, TAC-30692, NUDOCS 7912140353 | |
| Download: ML19291B914 (3) | |
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l Jm December 7, 1979 Irojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation ATTN:
Mr. A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Sir:
Pursuant to the telephone conference on December 7, 1979 between Portland General Electric Company (PGE) and your Staff members, the attached sup-plemental information concerning implementation of the TMI Short-Term Actions is submitted.
The attached supplemental information resolves the remaining items of disagreement identified by your Staff members for implementation of Short-Term Actions except for the modification of Containment isolation valves. As described in the PGE responses dated October 17 and Novem-ber 20, 1979, the implementation of this modification cannot be completed by January 1,1980 due to the unavailability of necessary hardware.
However, PGE will endeavor to expedite the delivery of material and will complete the modification by the startup of Cycle 3,1980.
Sincerely,
/
C. Goodwin, Jr.
Assistant Vice President Thermal Plant Operation and Maintenance CG/KM/4mg8B12 Attachment c:
Mr. Lynn Frank, Director State of Oregon Department of Energy Mr. D. G. Eisenhut Acting Director g
Division of Operating Reactors U. S. Nuclear Regulatory Commission 1583 359 7
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SUPPLEMENTAL COMMITMENTS FOR IMPLEMENTATION OF TMI SHORT-TERM ACTIONS 2.1.3.a Direct Indication of PORVs and Safety Valves:
PGE will complete modification of valve position indication for PORVs and safety valves by January 1,1980.
Both valve position indicating devices will be alarmed and indicated in the control room.
2.1.3.b Subcooling Meters:
A computer program to calculate the subcooling margin has been developed and incorporated in the Trojan plant process computer, P-250.
Any deviation from the subcooling region calculated by this program will be alarmed and indicated in the control room.
PCE intends to complete the installation of the Subcooling Margin Meters (SMM) by January 1, 1980. Since necessary naterials have not been shipped from the manufacturer yet, should any difficulty develop in material availability before January 1, 1980, PGE will promptly notify the NRC.
2.1.4 Containment Isolation:
Modification of 23 Containment isolation valves, which open upon resetting the Containment Isolation Signal (CIS) will not be com-pleted by January 1,1980 due to material availability problems.
However, PGE has implemented administrative controls to verify that the affected 23 valves are closed prior to resetting the CIS. The following is the description of the affected 23 valves:
Among the 23 isolation valves, fourteen (14) valves have either a check valve or a motor operated valve inside the containment as a redundant isolation. These redundant valves will not be affected by the CIS reset. The remaining nine (9) valves are in the Containment sump pump line (2), steam generator blowdown sample lines (4) and letdown orifice isolation lines (3).
The Contaimnent sump pump line has an air operated valve (CV4181) outside Containment and a motor operated valve (M04180) inside the Containment. Both CV4181 and M04180 will open upon resetting the CIS, if high sump level exists. A strict administrative order will be enforced to maintain the closed valve position of both valves when the CIS is reset.
Each of the four steam generator sample lines has one air operated valve located outside the Containment (CV2809, 2811, 2814 and 2880).
The steam generator sample lines are Type II fluid lines, as described in the FSAR Section 6.2, which is connected to closed systems inside 1580 3o0
3.
Containment and satisfy the FSAR committment to have a minimum of one isolation valve. In the event radioactivity is detected in these sample lines, the control valves will be automatically closed.
The probability of radioactivity releases to the atmosphere from these lines is judged to be minimal.
The letdown isolation lines have three air operated valves (CV8149A, B or C) inside Containment and one air operated valve (CV8152) outside Containment. Although the air operated valves inside the Containment will open upon CIS reset if they were open before the CIS, the redundant air operated valve outside Containment will remain closed.
Based on the above description and the positive administrative control over these 23 valves prior to resetting the Containment isolation signal, Containment integrity will not be jeopardized in the interim period prior to modification.
2.1.8.a Post-Accident Sampling Capability:
PCE will provide a capability for obtaining and analyzing grab samples of Containment air for hydrogen in addition to the current post-accident hydrogen analysis system as discussed in our previous responses to and the NRC recommendations in Section 2.1.9 of the TMI Short-Term Lessons Learned (NUREG-0578).
2.1.8.b Increased Range of Radiation Monitors:
PGE will provide effluent radiation monitors with the capability to measure as high as 300 pCi/cc for the Auxiliary Building exhaust, and 1 x 105 pCi/cc for Steam Jet Air Ejector Discharge and Containment atmosphere effluent.
Procurement and engineering efforts will be made to complete the installation of these effluent monitors as well as the high-range Containment area monitors by January 1, 1981. Should there be any problem in material availability which may prevent meeting this date, PCE will promptly notify the NRC.
2.1.9 Instrumentation for Containment Pressure and Water Level:
PGE will make every effort to complete installation of the Contain-ment pressure and water level instruments by January 1, 1981.
Should there be any problem in material availability which may prevent meeting this schedule, PGE will promptly notify the NRC.
KM/ms/4mg8B13 1580 361
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