ML20009F258
| ML20009F258 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/14/1981 |
| From: | Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| Shared Package | |
| ML20009F259 | List: |
| References | |
| NUDOCS 8107300220 | |
| Download: ML20009F258 (2) | |
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RMinogue NRC PDR Mr. D. E. Vandenburgh HShapar WButler Senior Vice President HDenton JKudrick Yankee Accmic Electric Company ECase SCavanaugh 1671 Worcester Road DEisenhut RCapra Framingham, Itassachusetts 01701 SHanauer JLedbetter RMattson
Dear Mr. Vandenburgh:
LRubenstein In your letter of June 11, 1981, you indicated a strong desire to pursue alter-native schem(s for mitigating the hydrogen combustion concern associated with a degraded core accident. However, you also expressed concern that the staff was not seriously considering concepts other than containment pre-inerting for the Mark I containments. Therefore, you saw a need for further assurance from the staff that no irreversible action would be taken to foreclose successful imple-mentation of an alternative scheme.
To clarify our position, we believe that containment decigns such as your Mark I containment require provisions for dealing with the potential for the combustion of hydrogen released in large amounts in short time,,eriods. Fur-thermore, in view of the potential consequences of the postulated degraded core event, we believe that a mitigation device or system should be installed and made operational within a timefrane of some 6 to 9 months. This is consistent with staff and ACRS concern that actions be taken promptly on the hydrogen niti-gation capability of other small containments.
Within these constraints, as stated above, the staff has viewed a pre-inerted atmosphere as the only known approach for the Mark I CWR containment for dealing with the hydrogen that might be evolved during degraded core accidents. This does not preclude the existence of alternative schemes. However, the staff is unaware of such alternative systens. The approaches or systems that are known to exist a-e felt by the staff to be too advanced to satisfy the early instal-lation date.
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