ML20042B785
| ML20042B785 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/23/1982 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0831, RTR-NUREG-831 AECM-82-94, NUDOCS 8203260140 | |
| Download: ML20042B785 (5) | |
Text
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o MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 164 0, J AC K S O N. MIS SIS SIP PI 3 9 2 05 9
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NUCR AR PRODUCTON oE PARTMENT x
.y U.S. Nuclear Regulatory Commission
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Office of Nuclear Reactor Regulation AS
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2 Washington, D.C.
20555 p
C Attention:
Mr. liarold R. Denton, Director 9
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Dear Mr. Denton:
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416 and 50-417 File 0260/L-350.0 NUREG-0831 (SER) Errata AECM-82/94 Mississippi Power & Light Company has conducted a review of the Grand Gulf Safety Evaluation Report (SER), NUREG-0831, and identified in letter dated October 13, 1981 (AECM-81/394) certain errors and inconsistencies in the SER text.
Enclosed is an errata listing identifying additional items that require clarification.
The errata has been discussed with Mr. M. E. Houston (Project Manager) of your office. We appreciate your efforts to include the errata in the next rupplement to the Grand Gulf Nuclear Station Safety Evaluation Report (NUREG-0831).
If you have any questions or require additional information, please contact this office.
Yours truly,
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L. F. Dale Manager of Nuclear Services RFP/JCC/JDR:ph Attachment cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. G. B. Taylor
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Mr. Richard C. DeYoung, Director p
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Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission l
Washington, D. C.
20555 8203260140 820323 PDR ADOCK 05000416 1ber Middle South Utilities System E
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-Attachment to AECM-82/94
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Additional Errors Noted in the Safety Evaluation Report for Grand Gulf Nuclear-Station (NUREG-0831). Suggested deletions are indicated as fdeletion] and j
recommended additions'are indicated as addition.
- 1) Chapter 2, Page 2-10, Subsection 2.3.3 SER Text:
l To address the meteorological requirements for ' emergency preparedness planning outlined in 10 CFR Part 50.47 and Appendix E to 10 CFR Part 50, the applicants have committed i
by letters (AECM-81/103, dated April. 10, 1981 and AECM-i 81/327, dated August 28, 1981) to provide meteorological monitoring capability and compensating actions on [the schedule-in NURE6-0654r Appendtx-27 Annew +] or before October 1, 1982.
Rationale for Change:
Neither of the letters outlined in the above statement contain a Mississippi Power & Light Company (MP&L) commitment to the July 1, 1982, implementation date outlined in NUREG-0654. Instead.-MP&L has consistently indicated that the Backup Meteorological System and the Class A Model will be operational on or before October 1,1982. The Safety Evaluation Report j
(SER) related to the operation of Grand Gulf Nuclear Station Units 1 and 2 should, therefore, be revised as_ indicated to reflect this position, t
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2)
Chapter 22, Page 22-20, Paragraph 7, Line 1 i~
In response to Item II.F.1.3 of NUREG-0737, the SER states that the required radiation monitors have been installed. This is a misinterpreta-tion of the submittal made in FSAR Amendment 49 (7/81).
FSAR subsections
- 7. 5.1. 2. 3. 6, 12. 3. 4. 3. and 18.1. 27. 3, all present a description of the Grand Gulf design on this issue. This design will be implemented, i.e.,
i installation of the radiation monitors, prior to fuel load. The SER l
should be amended to more accurately describe the. status of this system and its associated implementation schedule.
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Attachment to AECM-82/94
- 3) Chapter 9 Page 9-26, Subsection 9.5.1.2 SER text:
Auxiliary Building Standby gas treatment system charcoal filters Containment exhaust system charcoal filters El. 93'-0" open areas IA101, lAll7, 1A121, 1Al23 between col. 10.5-15.1 and G-J.5 (above metal grate floors)*
El. 119'-0" open areas 1 A201, I A211, [4 AE15,4 1 A222, between col. 13.0-15.1 and G-J.5 and between col. 8.0-12.0 and P.4-R*
El. 139' ^"
open areas I A301, [4 A414] 1 A316,1A321, IA322 between col. 13.0 [41,04-15.1 and G-[R) J.5 and between col. 5.5-13.6 and P.4-R*
El 166'-0" open areas 1 A401,1 A417, [4 A424] between col. 11.0-15.1 and G -J.5*
Railroad area, room 1A325 Rationale for Change:
The above changes were discussed with CEB's Firc Protection reviewer Mr.
G. Ilarrison and were submitted by letter October 13, 1981 (AECM-81/394).
These items have been identified by NRC, Region II as changes which must be made prior to criticality.
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Attachment to AECM-82/94 4)
Chapter 9. Page 9-26, Subsection 9.5.1.3 SER Text:
9.5.1.3 Gaseous Fire Suppression Systems Total flooding Halon 1301 systems are provided for the two computer and control panel rooms and in the PGCC floor sections in the control room and the control cabinets rooms.
ETkspammm4mhed wymM&m-2&pnme mmene Lion in eash asea,and-suf &isions halon ts-psovided b a.
double-shoe system:-] The computer room Halon 1301 systems are designed to provide a concentration of 5 to 7 volume percent in 10 seconds with a soak time of 10 minutes. The PGCC Halon 1301 systems are designed to provide a final concentration of 20 volume percent with a soak time of 20 minutes. Sufficient halon is provided for a double shot system. The systems are automatically actuated by heat detectors.
At our request, the applicants agreed as indicated in Table 1.6-1 of the FSAR to comply with all of the fire protection specifications contained in the NED0-10466A Report, Revision 2,-
dated March, 1978 which was previously' approved by us.
Rationale:
The above change is recommended on the basis of our response to question 13.22 and the proposed revision to 9.5.1.2.2.5 which is attached and will be included in FSAR Amendment 55.
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l GGNS FSAR 9.5.1.2.2.5 Caseous Extinguishing Systems Automatic carbon dioxide or automatic Halon 1301 total flooding gaseous, double shot extinguishing systems are provided where water is not a feasible. fire fighting agent due to the presence of non-waterproof electrical components. These areas are noted in Table 9A-2 of Appendix 9A.
Rate compensated heat detectors activate the automatic carbon dioxide systems and the automatic Halon 1301 systems. Automatic. controls close ventilation ductwork, doors,-and stop the operation of ventilating fans prior to discharge of the gaseous agent.
Carbon dioxide gas is stored in bulk quantity outdoors, separated from buildings. A carbon dioxide extinguishing system is designed to achieve a concentration of 30 volume percent within 2 minutes and a concentration of 50 volume percent within 7 minutes. A concentra-tion of 30 volume percent will be maintained for not less than 20 minutes if enclosed rotating equipment is involved.
Carbon dioxide storage capacity is sufficient to. provide two actuations of the largest system.
Halon 1301 for the computer room systems is stored in pressurized bottles located outside but adjacent to the room protected. Halon 1301 for the PGCC systems is stored in pressurized bottles located inside the ends of control cabinets in the control room and the control cabinet area (el. - 190').
The pressurized Halon 1301 bottles are provided with safety pressure relief valves. The computer room Halon 1301 systems are designed to provide a concentra-tion of 5 to 7 volume percent in 10 seconds and a final concentration of 7 volume percent for a soak time of 10 minutes. The PGCC Halon 1301 systems are designed to provide an initial concentration of 6 to 7 volume percent within 10 seconds and a final' concentration of 2 20 volume percent for a soak time of 20 minutes.
Prior to the automatic discharge of Halon 1301 or carbon dioxide into a room, a discharge alarm is sounded and a control room annuncia-tor is provided to alert personnel of system activation.
The local alarm provides personnel in the room adequate time to evacuate the area prior to system discharge. Controls of the halon systems are provided locally to abort the automatic discharge of halon if necessary. The annunciators in the control room, that indicate operation of an automatic fire suppression system, are initiated by control devices located outside the respective fire area protected by the automatic gaseous fire suppression system. This precludes damage of such control devices by the potential hazards of a fire in the protected area.
A piping and instrumentation diagram of the gaseous extinguishing systems is presented in Figures 9.5-5 and 9.5-6.
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