ML19291C081
| ML19291C081 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 12/07/1979 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19291C080 | List: |
| References | |
| NUDOCS 8001180387 | |
| Download: ML19291C081 (6) | |
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DUKE Poweli COMPAN Pow E tt DUILDING 422 SouTn Cnuncts SinEET, CitAHLOTTE. N. C. 28243 I
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December 7, 1979 VsCF Pots orm, TEtte omt Aata 704
$tta.e PeoovCtioN 273-4083 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Reference:
RII:WHM 50-369/79-34 50-370/79-20
Dear Mr. O'Reilly:
As requested by Mr. C. E. Murphy's letter of November 21, 1979, please find attached a response which supplements our November 8, 1979 response to the subject inspection report.
Very truly yours l
N jf'w ~ lh. ct.
William O. Parker, Jr.
LJB:scs Attachment
- 5190 8-8001180 287
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MCGUIRE NUCLEAR STATION SUPPLEMENTAL RESPONSE TO IE REPORT NOS.
50-369/79-34, 50-370/79-20 Deviation A.
Section 17.1.17.4 of the FSAR states that the QA records storage facility will meet the provisions of ANSI Standard N45.2.9, " Requirements for Collection, Storage and Maintenance of QA Records for Nuclear Power Plants."
Section 5.6 of ANSI N45.2.9 requires QA records storage facilities to be provided with a fire protection system.
Duke's QA Procedure QA-301 re-quires construction site QA storage facilities to be provided with either a dry chemical or cas fire suppression system.
Contrary to the above, the construction site QA records storage facility is not provided with an automatic fire supression system.
Response
An automatic halon 1301 fire supression system will be provided in the construction site QA records storage facility by February 1, 1980.
Deviation D.
Sections E.3.(c) and E.3.(d) of the FPR state that the fire protection piping systems will conform to the applicable NFPA standards (NFPA-13,
" Sprinkler Systems;" NFPA-14, " Standpipe and Hose Systems;" and NFPA-15,
" Water Spray Fixed Systems").
Contrary to the above, the water supply piping to the fire protection systems within the auxiliary building does not meet the applicable NFPA standards due to the following:
1.
Not, ally closed deluge valves which control the water supply to the auxiliary building are manually activated from manual stations within the auxiliary building and control room by electrical circuits which are not electrically supervised as required by Sections 1-6.1 and 5-3.6 of NFPA-13 and 8-5.2 of NFPA-15.
2.
The sprinkler systems waterflow alarp devices are not arranged to activate the deluge valves controlling the water supply to the fire protection piping systems as regnired by Sections 5-1.1 and 5.3.1 of NFPA-13.
3.
The arrangement of the 1-inch by-pass and proposed associated alarm devices will not provide a reliable means of supervising the piping systems as required by Sections 3-14.2.3 and 5-3.5.2 of NFPA-13.
Response
As stated in our previous response, it is recognized that there are minor differences between the McGuire fire protection design and the NFPA standards.
i790 199
Response to Deviation D Continued These differences were recognized and evaluated by the Office of Nuclear Reactor Regulation during their review and acceptance of the McGuire fire protection system. Appendix D of the McGuire Nuclear Station Safety Evaluation Report Supplement No. 2 states, "We have reviewed the design criteria and basis for the water suppression systems and conclude that these systems meet the guidelines of Appendix A to Branch Technical Posi-tion 9.5.1 and are in accord with the applicable portions of the National Fire Protection Association (NFPA) Codes, and are therefore, acceptable."
In the design of the McGuire fire protection system these Codes were used as guidelines and various deviations were discussed with the NRC. The following is a summary of the review regarding the operation of the loop deluge valve and 1-inch by-pass lines in the fire protection system as it is related to the cited items.
In regard to Item D.1 which raises a concern about the electrical supervi-sion of the wiring to the deluge valves, the following information, which has been discussed with the NRC during site visits, is provided. A sepa-rate circuit is provided for each deluge valve.
Supervision of the wiring from the Control Room to the tripping circuit is provided with alarm to the Control Room to indicate malfunction.
Supervision of the wiring from the tripping circuit to the deluge valve has not been provided; however, this is acceptable since failure to complete the circuit for one deb.ge valve would have no effect on circuitry for the second deluge valve.
Operation of one deluge valve will supply the totol Auxiliary Building with water capacity greater than system demand. As an additional measure each of these deluge valves may be manually tripped open at each valve location.
In regard to Item D.2, which raises a concern about the activation of deluge valves by sprinkler system water flow alarm devices, the activation of the deluge valves was discussed in Mr. William O. Parker's August 1, 1978 letter to H. R. Denton, NRC/0NRR. weich stated, "The two deluge valves which are electrically tripped from bratk-glass stations throughout the Auxiliary Building or from the Control Room can also be manually tripped at each valve.
With the by-pass line around cach valve providing sufficient water for the largest automatic sprinkler system flow or two hose stations, a fire at the batteries will not affect the fire protection system water supply."
Mr.
W. O. Parker's letter of November 2, 1978 to Mr. Denton further explained that, "The two deluge valves which control the fire protection water supply for the Auxiliary Building may be manually tripped open at the valve upon loss of electrical power.
In addition, a normally open 1-inch by-pass line is provided around each deluge valve. As shown in Figure 9.1, these lines have adequate capacity to supply two hose stations at the battery rooms.
This figure shows the head loss curve for the piping system through the 1-inch by-pass lines and out through the hose nozzles. Also shown are curves depict-ing fire protection jockey pump performance. As can be seen, with only one jockey pump in operation, the total flow to the two hose racks will be 188 gpm, or 94 gpm each, with a nozzle pressure of 195 feet.
Figure 9.2 shows the effective reach of a wide fog stream versus nozzle pressure for these nozzles.
From this figure, it can be seen the effective reach with 195 feet of nozzle pressure is approximately 39 feet. These two features provide assurance that a fire at the batteries will not adversely affect the fire protection system water supply."
As stated previously the two deluge valves serving the Auxiliary and Reactor Buildings were designed to be normally closed to preclude.the possibility of incapacitating safe shutdown systems or components due'.to' flooding resulting 1790 200-
Response to Deviation D Continued from failure or inadvertent operation of the fire supression system. As indicated above the 1-inch by-pass line around each deluge valve will main-tain pressure on the headers wnd will provide sufficient water to supply any automatic sprinkler system or two hose stations without activating the deluge valves.
The deluge valves can then be t --.irslly tripped from break-glass stations located throughout the Auxiliary Building, from the Control Room, or manually at each valve. This design provides immediate fire protection
. response capability.
It should also be noted that the deluge valves are redundant in that operation of one deluge valve will supply the total Auxiliary Building with water capacity greater than system demand.
In regard to D.3 which raises a concern about piping supervision, the vr.lves in the 1-inch by-pass line are locked open and will be checked on a monthly basis as required by the McGuire Technical Specifications. The NRC was advised of this arrangement in Mr. W. O. Parker's March 22, 1978 letter to Mr. H. R.
Denton, NRC/0NRR, which stated, " Fire Protection valves which are normally required to be open are either electrically supervised or locked and periodi-cally checked."
The design of the deluge valve and the 1-inch by-pass lines in the McGuire fire protection system as outlined above meets intent of Branch Technical Position APCSB 9.5-1.
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1790 201
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