ML20031G573
| ML20031G573 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/19/1981 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20031G574 | List: |
| References | |
| TASK-2.K.2.10, TASK-TM TAC-45188, NUDOCS 8110230292 | |
| Download: ML20031G573 (5) | |
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'd3 SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 s street, Box 15830, Sacramento, California 95813; (916) 452 3211 October 19, 1981 f dCE!Vtoe s
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DIRECTOR 0F NUCLEAR REACTOR REGULATION ATTENTION JOHN F STOLZ CHIEF
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OPERATING REACTORS BRANCH 4 U S NUCLEAR REGULATORY COMMISSION
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'Q WASHINGTON D C 20555 DOCKET 50-312 RANCHO SEC0 NUCLEAR GENERATING STATION UNIT 1 TMI ACTION PLAN ITEM 2.K.2.10 Your letter of October /,1981, requested additional information on the safety grade anticipatory ~ reactor trip we plan to install at Rancho Seco Unit 1.
The information below corresponds to the items in your request.
i 1.
Because of conflicting information provided previously, describe which variables will cause each trip (e.g., do the sensors only monitor hydraulic pressure for the main turbine and each of the two MFWP turbines or is the discharge pressure also monitored for each MFWP?).
Discussion:
Tne hydraulic pressure for the main turbine and each of the two MFWP turbines are monitored for inputs to the Reactor F otection System as the tripping function.
2.
Discr1be your separation criteria (e.g., does it conform to Regulatory Guide 1.75 Revision 27).
Discussion:
Our design provides for independent and separate channels to monitor each variable.
Four pressure switches are mounted on each of the turbine pedestals which are designed to withstand a seismic event.
The cable from each pressure switch is qualified to IEEE 383 and is routed in a separate, channelized, rigid tteel conduit system to its associated RPS cabinet. The redundant conduits from each location are mounted on a common seismic support. While < single credi.ble event might disable all of these switches with this configuration, the protective system 1s not itself disabled and the devices are not required to detect or mitigate the plausible events that might disable them. We therefore conclude that our installation conforms to IEEE 279, IEEE 384, and Regulatory Guide 1.75.
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l J0His F STOLZ October 19, 1981 3.
State when your pressure sensor qualification data will be available.
Discussion:
SMUD is. presently producing specifications to procure new pressure switches. The switches will be specified to meet IEEE-323; 69/4 and IEEE-344; 1975 criteria.
lhe vendcr qualification information will be available by August of 1982.
4.
State how often input to sensor (hydraulic pressure) through trip signal will be tested in e"icirety.
Discussion:
Yearly 6.
For sensors located in non-seismic areas which have not previously contained RPS inputs, perform and submit an analysis which shows that the installation (including circuit routing) is designed such that the effe.:ts of credible faults (i.e., grounding, shorting, application of high voltage, or electro-magnetic interference) or failures in these areas could not be propagated back to the RPS and degrade the RPS performance or operability.
Discussion:
Referring to the drawings previously submitted, each contact being monitored by the reactor protection input system is buffered or isolated from any other portion of the RPS. Therefore, grounding, shorting, etc., will not propaghte back into the RPS and degrade its performance.
Sensor mounting will be on a seismically qualified stand which provides sepa-ration for the IEEE-279 criteria.
Sensing lines to the pressure switches will be protected. A trip will occur even if a line is severed.
Electrical circuit routing for the sensors will meet the criteria set forth in IEEE-279,1971.
6.
Submit " Seismic and Environmental Qualification Summary Reports" for the equip-ment which has not been previously submitted.
In addition, we require that you demonstrate that the environmental test conditions bound the actual worst case accident conditions expected at the installed locations.
Discussion:
As stated in Item 3, the sensors will be procured to meet the qualifications set forth by IEEE-323, 1974 and IEEE-344, 1975. The new modules to be in-stalled in the RPS cabinets meet the criteria for the design of the RPS as set forth by topical report, BAW-10006, 7.
Assure that the ARTS testability includes provisions to perform channel functional tests at power. Testing of this circuitry is to be included in the monthly surveillance tests.
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JOHN F STOLZ
-3 :
October 19, 1981 Discussion:
Referring to the drawings previously submitted, channel testing is provided on the contact buffer by switches S1 and S2. On completion of the system installation, the monthly surveillance test will be modified to include the anticipatory trip scheme.
8.
Include in the final design submittal the RPS check-out procedure which wsll demonstrate both the operability of the new trip circuitry and the continued operation of the previous RPS.
Discussion:
The check-out procedure for the RPS is included as part of this submittal.
As discussed in Item 7, the procedure will be changed to reflect the additional circuitry and its operation.
The procedures attached are:
1.
I-108A Revision 17, "RPS Channel A. Test".
Only one procedure is enclosed for your review since the other three pro-cedures are identical with the exception of the title.
2.
I-111 Revision 9, "RPS Channel Calibration".
If we can provioe any additional information, please advise.
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John ( Mattimoe Assistant General Manager and Chief Engineer Enclosures l
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