ML19323B071
| ML19323B071 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 04/16/1980 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| Shared Package | |
| ML19323B072 | List: |
| References | |
| NUDOCS 8005090208 | |
| Download: ML19323B071 (2) | |
Text
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UNITED STATES y,w g
NUCLEAR REGULATORY COMdAISSION i
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April 16,1980 Docket Nos.: 50-369 and 50-370 Mr. William 0. Parker, Jr.
Vice President, Steam Production Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Parker:
S!!BJECT: PERSONNEL AIRLOCK D0OR SEAL DESIGN (MCGUIRE NUCLEAR STATION, UNITS 1 & 2)
It has come to our attention that certain plants under construction plan to use personnel airlocks with inflatable door seals.
Inflatable door seals, unlike passive compressible door seals, involve the use of active components.
These active components must meet certain safety design criteria, e.g., single active failure criteria and redundancy requirements. We understand that the McGuire plant uses such inflatable door seals; therefore, we request that you provide the following information:
1.
Provide detailed drawings of the personnel airlock door seals and P&I diagrams of the compressed air systems that will maintain the pressure, in the inflated seals during normal operating and accident conditions; Include diagrams of the control and indication systems involved with these seal systems.
2.
Describe the operation of the seal systems during normal operating and accident conditions. Give the design requirements for the systems, including seismic and environmental qualification, quality assurance requirements, and safety-grade classification.
Describe the provisions for protection against single active failures 3.
in the seal systems. Discuss the consequences of loss of power, i.e.,
loss of offsite power, loss of all AC power, or loss of DC power. Note whether system failures are indicated and alarmed in the main control room. Discuss backup seal pressurization systems, such as compressed air or nitrogen tanks, and whether such backup systems have the capacity
i 1
Mr. William O. Parker, Jr. April 16,1980 l
to assure door seal integrity for extended periods during and following an accident, assuming certain failures, e.g., loss of power.
It is requested that you provide this information no later than May 15, 1980.
Sincerely,
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Robert L. Baer, Chief Light Water Reactors Branch No. 2 Division of Project Management
Enclosure:
Ltr R. P. Denise to S. A. Varga dated 4/11/80 cc: See next page 4
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