ML19210D591
| ML19210D591 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 11/23/1979 |
| From: | Baynard P FLORIDA POWER CORP. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| 3--3-A-3, 3-0-3-A-3, NUDOCS 7911270357 | |
| Download: ML19210D591 (5) | |
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Florida Power C O H P Q R A r 10 9 November 23, 1979 File:
3-0-3-a-3 Mr. Robert U. Reid Chief Operating Reactors Branch #4 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72
Dear Mr. Reid:
On November 9,1979, Florida Power Corporation received your letter of November 7,1979 requesting additional information concerning BAW Report 1564, " Integrated Control System Reliability Analysis."
Enclosed is our response to the recommendations contained in the enclosure of your letter.
In the areas where we indicated that an engineering review is still ongoing, we will submit additional Information as soon as it is available.
If you require any further discussion concerning our response, please contad us.
Very truly yours, FLORIDA POWER CORPORATION s
y:: A Dr. P. Y.
Baynard Manager Nuclear Support Services Simpson(BAW-1564)D75 1T98 552 7 911270 N 7 General Office 320i inirty fourth street soutn. e o Boi 14042. st Petersburg Fionaa 33733 813 -866-5151
STATE OF FLORIDA COUNTY OF PINELLAS Dr. P. Y. Baynard states that she is the Manager, Nuclear Support Services, of Florida Power Corporation; that she is autnorized on the part of said company to sign ind file with the Nuclear Regulatory Commission the information attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of her knowledge, information, and belief.
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Baynard Subscribed and sworn to before me, a Notary Public in and for the St. ate and County above named, this 23rd day of November, 1979.
Notary Public Notary Public, State of Florida at Large, My Commission Expires. August 8, 19839h b 7 -. r 3 CameronNotary 3(D12)
FPC RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION ON REPORT BAW-1564 For the following recommendations from report BAW-1564, - Describe how you plan to implement the recommendation; and - The schedule for the implementation; or - Basis for not implementing the recommendation at your plant. 1. ICS-Related NNI/ICS power supply reliability: a. NOTE: This area is of particular importance because it is listed as the source of most of the ICS input failures. The staff is not only concerned with the " reliability" of the power supplies, but also the design philosophy of the power supply implementa-tion. It appears that power supply failures can lead to multiple problems such as the Ranch Seco event of March, 1978.
RESPONSE
The following describes the NNI/ICS power supply reliability for CR//3: 1. NNI(x) - Supplied from 120 VAC Vital bus 3C, Panel VBDP-5, Breaker 25, Circuit VBF-31. 2. NNI(y) - Supplied from 120 VAC Vital Bus 3D, Panel VBDP-6, Breaker 25, Circuit VBF-32. 3. ICS(x) - Supplied from 120 VAC, Regulated Instrument Bus 3B, Panel VBDP-2, Breaker 3, Circuit ICF-6. 4. ICS(y) - Supplied from 120 VAC, Vital Bus 3B, Panel VBDP-4, Breaker 23, Circuit ICF-5. ICS(x) and ICS(y) modules auctioneer between (x) and (y). External E/Ps are fed from the (y) feed. The re '. o re, both the ICS and NNI have reliable power sources. b. Reliability of input signal from the NI/RPS system to the ICS - specifically, the RC flow signal:
RESPONSE
The NI/RPS power supplies are fed from the four (4) vital buses with DC backing via inverters. Therefore, the signals from NI/RPS to ICS are reliable. Regarding Items a. and b. above, we are presently in the process of designing a system that will preclude an inverter failure from interrupting power to the ICS system. This system will utilize a static transfer switch at the output of each inverter which will Simpson(BAW-1564)D75 }3hb
automatically transfer the input power of the ICS to an alternate source upon inverter failure. A 10 CFR 50.59 review is now being performed by our A/E with an expected completion date of 11/26/79. We predict a 26-week time period between material ordering and final installation of the system. We are also in the process of further evaluating the NNI & ICS power supply as a result of the recent event at Oconee as described in IE Information Notice No. 79-29. Upon completion of this review, we will appraise you of our findings and proposed action. c. ICS/ BOP system tuning, particularly feedwater condensate systems and the ICS controls. NOTE: Although this concern is related to tuning, it appears that more basic design and/or operational problems in the feedwater (and related) system may exist. Therefore, include a discussion of the following items: (1) Any particular operational (startup, etc.), problems experienced at your plant with respect to the ICS. Reference to previously submitted information is acceptable.
RESPONSE
The ICS system at CR#3 is reliable and tuned. Minor problems include module failures periodically caused by component failure in the modules. These occurrences have been infrequent. (2) Bases for operator intervention in place of automatic ICS action (including start-up, power operation and shutdown activities).
RESPONSE
The operators at CR#3 do not intervene with the ICS automatic control unless there has been a failure within the ICS, at which time the operator places that subloop in the manual mode. (3) Procedures used by the operator to perform the operation described in ic(2) above.
RESPONSE
All the plant Emergency and Abnormal procedures, which rely upon the ICS to perform an automatic function, require the operator to verify that this actinn is being performed, or take manual control and perform it manually. 1X98 '55 Simpson(BAW-1564)D75
e (4) Additional training provided to the operator.
RESPONSE
CR#3 operators have received the following additional ICS training: - 6 hours with regard to the ICS response to 3 RC pump operation. I week of simulator training every 2 years, specifically on the ICS. - 4 hours of ICS review during requalification training. 2. Balance of Plant a. Main feedwater pump turbine drive minimum speed control - to prevent loss of main feedwater or indication of main feedwater.
RESPONSE
Problems at CR#3 which have caused runback to minimum speed of the main feedwater pump turbine have been due to dirt in the governor oil system. REI-79-9-1 has been initiated to investigate the addition of an oil filter system for the governor oil. A request has been made to the turbine manufacturer for recommendations and a proposal for a filter system for.the governor to correct this problem. Upon receipt of this proposal and review by our Engineering Department, we will install this modification as seon as possible. b. A means to prevent cr mitir,20e the consequences of a stuck-open main feedwater startup valce.
RESPONSE
A stuck-open main feedwater startup valve can be mitigated by closing FWV-33 or 36 from the control room. c. A means to prevent or mitigate the consequences of a stuck-open turbine bypass valve.
RESPONSE
A stuck-open turbine bypass valve can be mitigated by closing MSV-53 or 54 from the control room. }19h b Simpson(BAW-1546)D75}}