ML20003E901
| ML20003E901 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 04/13/1981 |
| From: | Utley E CAROLINA POWER & LIGHT CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| IEB-80-06, IEB-80-6, NO-81-643, NUDOCS 8104170463 | |
| Download: ML20003E901 (2) | |
Text
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,3 : - 3 April 13, 1981 File: NG-3514(B)
Serial No.:
N0-81-643 Office of Nuclear Reactor Regulation ATTENTION:
Mr. T. A. Ippolito, Chief Operating Reactors Branch No. 2 United States Nuclear Regulatory Commission Washington, D. C.
20555 BRUNSWICK STEAM ELECTRIC PLANT UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 AND 50-324 LICENSE NOS. DPR-71 AND DPR-62 ADDITIONAL INFORMATION - IE BULLETIN 80-06 RESPONSE
Dear Mr. Ippolito:
Su= mary This letter is to confirm infor=ation provided to NRC 0id EG&G by Carolina Power & Light Company (CP&L) during telephone con-versations on March 18 and 24, 1981. Participants in the calls were Messrs. P. Bernard and B. Price (CP&L), D. Hackett (EG&G), and P. Bender (NRC). The subject of the discussions was CP&L's August 12, 1980 letter, BSEP/80-1331 which is a supplemental response to IE Bulletin 80-06.
Information Provided The items listed below su=marize NRC/EG&G questions together with the information provided by CP&L:
1.
Refer to Figure 3.
Question: What would happen to the valve (s) if the power supply to the actuation relay is lost and is this satisfactory?
Response: Nor= ally shut valves Ell-F051A and Ell-F053A are in series with nor= ally shut valves, Ell-F052A and Ell-F026A, respectively. The LOCA actuation signal for these valves comes from the same power supply. Upon loss of this power supply, the valves will remain "as is."
Due to other valves in the RER system, one train of the RHR system will not function. However, the redundant train will not be impacted. The same is true for valves E11-F051B and Ell-F053B.
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O 2.
Refer to Figure 4.
Question: What would happen to the valves if the power supply to the actuation relay is lost and is this satisfactory?
i Response: Valve SW-V141, in series with check valve SW-V192, lays up the vital service header with fresh water during normal operations. During a LOCA, the well water supply is secured by shutting SW-V141 and service water is supplied to the header through other valves. Upon loss of the power supply to the LOCA actuation signal, valve SW-V141 will remain "as is."
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This is satisfactory, since the check valve will pre-vent back flow through the 1-1/2 inch line.
3.
CP&L provided an explanation of Figure 5.
It was explained that the sketch was simplified and did not show the Limitorque switches which deenergized the 42/0 and 42/C coils when the valve was fully open or shut.
It was also explained that the " seal-in" for the 42/0 coil would not be disconnected. CP&L con-firmed that the inlet and exhaust dampers do not shut on an actuation signal.
4.
CP&L provided an explanation of the Local Switch and Control Switch in Figure 6.
It was pointed out that the design allowed the opening of two containment area sample valves at the same time. This, however, has no impact on the containment isolation function of these valves.
5.
CP&L provided an explanation of Figure 7.
It was explained that, upon loss of power to the LOCA j
actuation signal, the valve would fail "as is";
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however, since TD-SV-3601 and TD-SV-3598 are series valves and the power to the LOCA actuation signal for the valves are from different power supplies, the loss of one power supply will not prevent
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shutting the redundant valve.
We trust that this information is satisfactory for your use.
Yours very truly, l
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M EM (
E. E. Utley Executive Vice President JM/je (0029)
Power Supply and cc:
Mr. P. Bender (NRC)
Mr. D. Hackett (EG&G) l
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