ML19262A382
| ML19262A382 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/10/1974 |
| From: | Schwencer A US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7910260701 | |
| Download: ML19262A382 (1) | |
Text
e P'9TRIBUTION*
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Docket No. 50-289 ARenneke k
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PSeiffert, OGC j
Metropolitan Edison Company Ro (3)
ATTS:
Mr. Robert C. Arnold RMBernero g
Vice President EGoulbourne N
Reading, Pennsylvania 19603 LWR 1 & 2 BCs ACRS (16)
Gentlemen:
5 Extra Cys In your letter to A. diambusso of April 5, 1974, you described a design I
modification to the pressurization jacket of penetration No.112 (main I
secam line). The modification consists of disconnecting the pressur-ization air supply line and capping both ends. In effect, this will j
make No.112 a conventional, unpressurized penetration and vill reduce the number of penetrations served by the pressurization system from 129 to 128. You have justified making this modification rather than repairing the penetration cooler leak which causes the problem on the basis that the repair would require cutting out the 28-inch main steam i
line section just downstream of this penetration. This section of line q
was considered in some detail during recent considerations of potential high energy line ruptures outside containment and is now subject to special inservice inspection to assure its integrity.
We agree with your conclusion that safety is better served by leaving the steam line intact and modifying the penetration pressurization system for penetration No. 112. However, we will require one change in the design modification. The line on the penetration pressurization l
Jacket should be fitted with a valve so that during the containment l
leak tests required by Technical Specifications, the jacket can be vented, thereby testing the containment liner boundary. The jacket j
valve should be closed during nornal plant operations to provide a i
secondary leakage boundary. Your procedures should be modified to 1
reflect this requirement.
Sincerely, enou s 1485 262 y
l A. Schwencer, Chief Light Water Reactors Branch 2-3 g
Directorate of Licensing i
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cc: George F. Trowbridge, Esquire Shaw, Pittman, Potts & Trowbridge g c, nu lica acne c,
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