ML20100A904
| ML20100A904 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/28/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20100A907 | List: |
| References | |
| NUDOCS 8412040128 | |
| Download: ML20100A904 (2) | |
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DUKE POWER GoMPAxy P.O. box 33180 CHARLOTTE, N.O. 28242 HALB. TUCKER-1sternoxz O""1-November 28, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission
. ashington, D. C.
20555 W
~ Attention: Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Docket Nos. 50-413 and 50-414
Dear'Mr. Denton:
On October 23, 1984 representatives from the NRC's Containment Systems Branch toured the Catawba Units 1 and 2 Containment Buildings as a part of the Staff's review of SER Confirmatory Issue 12, Main Steamline Break Using a Revised Heat Transfer Model. During this tour, the Staff requested a followup response to the following questions.
1.
Will valves in the lower containment be in their correct position prior to steam generator tube bundle uncovery?
Response
The valves listed in Table 1 of our October 8,1984 submittal were reviewed and it was concluded that the valves would be in their correct position before the MSLB or would receive a containment isolation signal to reposition before steam generator tube bundle uncovery, with the exception of the pressurizer P0RV block valves.
Since the PORV's are not expected to open in this event, the block valves should not be required.
2.
Discuss any Class IE equipment located in the deadended compartment where the main steamlines penetrate the crane wall.
Response
The only required Class IE equipment located in the ventilation rooms where the main steamlines penetrate the crane wall is valves ND37A and ND2A (Residual Heat Removal Isolation Valves).
Each valve is normally closed and has a redundant, normally closed isolation valve upstream, inside the crane wall.
In addition, three of the four valves have power removed during operation as discussed in Section 5.4.4.1 of SSER #3.
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Mr. Harold R. Denton, Director
-November 28, 1984 Page Two
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3.
Does the position of the guard pipe preclude steam blowdown in the deadended compartment?'.
Response
As shown on the attached drawing CN-1491-SM003, the guard pipe is welded to the penetration assembly, thereby precluding steam blowdown from a MSLB in the deadended compartment.
Very truly yours,
/h Hal B. Tucker ROS:slb cc: Mr. James P. 0'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Catawba Nuclear Station Robert Guild, Esq.
P. O. Box 12097 Charleston, South Carolina 29412 Palmetto Alliance 21351 Devine Street Columbia, South Carolina 29205 Mr. Jesse L. Riley Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207
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