ML19211A952
| ML19211A952 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 12/14/1979 |
| From: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578 TAC-30680, NUDOCS 7912210366 | |
| Download: ML19211A952 (18) | |
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.a December 14, 1979 Trojan 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:
Attached please find supplemental information (Attachments I and II) concerning the Trojan Nuclear Plant Auxiliary Feedwater (AFW) System, which was requested in your telecopy of December 10, 1979 and pursuant to discussions with members of your staff. The attached information delineates the Trojan design in the area of:
(1) Automatic initiation of AFW System, and (2) AW flow indication to steam generators.
Description of Trojan plant design of the above two areas have been orig-inally provided to the NRC as PCE response to NUREG-0578 on October 17, 1979, and supplemented in our response dated November 26, 1979 to NRC questions (Mr. D. Eisenhut's letter dated October 3,1979). It is our belief that the attached supplement is sufficiently descriptive to satisfy your requests.
Sincerely,
//
a C. Goodwin, Jr.
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Assistant Vice President Thermal Plant Operation and Maintenance 1637 323 CG/KM/mg/4sa9B27 Attachment
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Mr. Lynn Frank, Director State of Oregon
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Department of Energy 60 DI4WW6J M fils1 Mr. D. G. Eisenhut A8o[/,ci?$ A6cGiv F Division of Operating Reactors tfg, pg g
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ATTACHMENT I SUPPLEMENTAL INFORMATION IN RESPONSE TO THE NRC REQUEST ON DECEMBER 10, 1979 1.
Section 2.1.7.a - Automatic Initiation of the Auxiliary Feedwater (AFW)
System NRC Request:
We require that the licensee provide information that describes how the AFW automatic initiation system design meets each of the control grade functional criteria in NUREG-0578 (2.1.7.a) and the clarifications to NUREG-0578 in the October 30, 1979 NRC (H. Denton) letter to all operating plants. The information should be sufficiently descriptive to permit independent tech-nical review of the information and a conclusion that each of the criteria are met.
To demonstrate conformance with criteria 1, 2, 5, and 7, specific descriptive information (reference to specific FSAR sections is acceptable) supported by electric 41 drawings, such as schematic or elementary wiring diagrams, snould be submitted.
For power supply Criteria 4 and 6, the licensee should submit a table or a detailed power distribution one-line diagram indi-cating power supply channels for each component.
To demonstrate testability Criteria 3, the licensee should submit a summary description of the functional test procedures al;ng with the existing or proposed test interval - (eg, Standard Technical Specification surveillance performance for typical engineered safety feature systems).
PGE Response:
Subsequent to the issuance of NUREG-0578 and the NRC letter, dated September 13, 1979, Trojan design had been reviewed and suf ficiently descriptive information was submitted to the NRC on October 17, 1979. The information in that submittal provided a description of AFW System design including appropriate reference to the specific Trojan FSAR sections where possible.
Enclosed, in Attachment II, are a summary table of power supply for major components in the auxiliary feedwater system and a copy of associated electrical schematics and logic drawings. The summary table delineates power source, required voltages and the function of components to be powered.
Periodic Operating Tests (POT) procedures have been written which outline in detail the methods and reporting to be used in testing the pumps, valves and their initiating circuits required by the Technical Specifications (see Paragraphs 4.7.1.2.1 and 4.7.1.2.2).
The 31-day interval tests are covered in:
1637 324
POT-5-1 AFW Pump Performance POT-5-2 AFW Valve Performance and Valve Lineup The 18 month interval tests are covered in:
POT-5-3 AFW 18-Month System Performance (Auto Start of Pumps)
POT-25-2e Testing af SSPS Slave Relays to Initiate AFW Auto Start 2.
Section 2.1.7.b - Auxiliary Feedwater Flow Indication to Steam Ge nert '.o rs NRC Request:
We require information of the similar nature to that described in 2.1.7.a, above, to demonstrate conformance with the 2.1.7.b criteria and clarifications to NUREG-0578 on October 30, 1979 NRC (H. Denton) letter to all operating plants; namely, single failure, testability, power supply, and indication accuracy.
PGE Response:
The design decription of existing auxiliary feedwater ( AFW) flow indicators, as well as capabilities of indirect flow indication by steam generator water level and local AFW flow switches were provided in our submittal, dated October 17, 1979.
Pursuant to the telephone conversation between PGE and your staff, by January 1, 1980, the AFW flow instrument channels will be powered from the vital instrument buses through appropriate isolation devices.
With regard to functional test and indication accuracy, flow transmitters and indicating instruments are calibrated every refueling outage to maintain an accuracy of +1/2 percent for the transmitters and +2 percent for the indicators.
The design of the existing cables for the AFW flow indicators satisfies the same requirements as for the other indication devices in accordance with the licensing commitments in the Trojan FSAR. Therefore, by modifying the power supply to the AFW flow instrument channels, it is our belief that the Trojan design satisfies the NRC requirements in NUREG-0578 as well as the NRC letter of clarifications on October 30, 1979.
KM/CCT/mg/4sm9A30 1637 325
ATTACHMENT 11 Sheet 1 of 2 AUXILIARY PEEDWATER SYSTDI POWER SOURCES i
Schematic j
Compone nt Pu nc t ion Voltage Source Diagram
- 1 A.
Steam Turbine-Driven Pump 102A 1.
Trip & Throttle Valve HO-3071 Hanual/ auto control 125V d-c Bus DIO, BKR 72-1023 E-333 2.
Steam Inlet Valve HO-3170 Control & indication 480V a-c HCC B23, BKR 52-2334 E-326 3.
Stesa Inlet valve HD-2218 Control & indication 480V a-c HCC B23 BKR 52-2304 E-372 Steam Inlet Valve HO-2228 Control & indication 480V a-c HCC 321. BKR 52-2139 Steam Inlet Valve Ho-2238 Control & indication 480V a-c HCC B23, BKR 52-2314 Steam Inlet Valve HO-2248 Control & indication 480V a-c HCC B21 BKR 52-2143 4.
S. C. Plow Control Valves Remote controllers 120V a-c Pref. Instr. Bus Y11 BKR 14 E-637 CV-3004 A1, 81, C1 & D1 Local controllers & HOVs 120V a-c Pref. Instr. Bus Yll, BKR 12 5.
Auto Start & S. c. Blowdown 120V a-c Pref. Instr. Bus Yll, BKR 11 E-373 Isolation (Channel A) 6.
Pressure Loop Instruments E-1722 PY3083At & A2;, PDC 3083A Remote speed control 120V a c Pref. Instr. Bus Y11 BKR 11 Power Supplies JQ1909Al & PQ514 120V a-c Pref. Instr. Bus Y11, BKR 12 PDY3083A, POK3083A Local Speed control 120V a-c Pref. Instr. Bus Y11. BKR 12 7.
Service Water System AFW Control & indication 480V a-c HCC 525, BKR 52-2533 E-381 Pump Suction Valve H03045A D
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c ATTACHMENT II Sheet 2 of 2 AUIILI ARY FEEDWATER SYSTEM POWER SOURCES Schematic Component Punc t ion Voltage Source Diagram
- B.
Diesel-Driven Pump 102B 1.
Diesel Start & control 24V d-c Battery M12-36 &
t Battery charger 120V a-c Pref. Instr. Bus Y22 BKR 12 E-332 Indication 120V a-c Pref. Instr. Bus Y22. BKR 12 120V a-c Pref. Instr. Bue Y22, BKR 11 E-373 2.
Auto Start & S. C. Blowdown Isolation (Channel 5)
E-1722 3.
Pressure Loop Instruments PY308381 582, PDC 30838 Remote speed control 120V a-c Pref. Instr. Bus Y22, BKR 11 120V a-c Pref. Instr. Bus Y22 BKR 12 Power Supplies JQ190981 & PQ 545 PDY30835. PDK3083B Local speed control 120V a-c Pref. Instr. Bus Y22 BKR 12 4.
S. C. Plow Control Valves Remote controllers 120V a-c Pref. Instr. Bus Y22 BKR 18 E-637 CV-3004A2, B2, C2 & D2 Local controllers 120V a-c Pref. Instr. Bus Y22. BKR 12 5.
Service Water System AFW Control & indication 480V a-c HCC B26, BKR 52-2637 E-381 Pump Suction Valve HO-30455 a A copy of the schematic diagram is attached for your information.
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