ML19254B185
| ML19254B185 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/21/1979 |
| From: | Jay Collins NRC - TMI-2 OPERATIONS/SUPPORT TASK FORCE |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7909240549 | |
| Download: ML19254B185 (2) | |
Text
.,,.
i
~
I i
I August 21, 1979
}
Dockat lio. 50-320 August 21, 1979 t
I Mr. Robert C. Arnold Sr.-Vico President l
Metropolitan-Edison Company Three Mila Island I'uclear Station Mail Stop 201 l
Middictown, PA I
t l
Lear Mr. Arnold:
SU2J CT: TECI'!!ICtd. SPECIFICATICNS FOR FIRE PROTECTION MODIFICATIONS, TMT-2 i
1 Eacently, the NRC-TXI-2 Support Staff conducted an ivdopth review of the fire protection syste:as installed in various TMI-2 exhaust ventilation systezas for the protectina of charcoal filters against a potential fire, j
Our observaticas and reconnendations for correctivo action are noted below.
i 1.
The manual valve on the supply to the deluge / sprinkler systems to l
the fuel landling building. AH-F-14A/S (item h of the Tech Specs) and auxiliary building exhaust filters AE-F-10A/B (iten k of tha Tech Specs) are praeantly in the closed position. As the systen now exists, operator action la required to actuate the fire protection for either unit. This is acceptable, however, because of existing circumstances the areas adjacent to those units nov house natarial uhose fire loading far exceeds the initial design criteria. These i
areas are alao beyond the reach of the presently installed fire homes.
.It is therefore suggested that detectors be installed and portable fire suppression be added is;: mediately to protect thusa areas. The i
detectors should alarn locally and in the control room. It is further sug;cated that a survey be made to reevaluate the fire loading and the fire protection availabla in other arena where the existing conditions have changed drastically since tha initial conditions.
I 2.
The existin; valving arrangement and alarming system for the protection of the condenser exhaust filters (ites 1 of the Tech Specs) is not f
acceptabla. As piped up it requires manually opening three valves, one at the unit cad two near the standpipe, before the fire protection for I
this unit can be actuated. It is recocnnended t'at the valva ucar the a
l unit be locked in the open positina. It will still require the opening of two valvea but thesa are located near each other cud it will eliainata i
I l
992 25B P00PiDPiUM.
"oa< o 5-1
.e a.
Distribution:
August 21,197 FIT eket File J SEP f/f TMI R/F Mr. Robert C. Arnold NRR r/f PSS r/f NRC PDR Local pdr opening the third valve which is approximately 30 feet away. As installed, the fire detection buzzer alarms locally, near the unit, j
It is located approximately 30 feet or more from the canned station.
Because of the noise level in that area and because the attendant at that station may be doing other duties, it is recocmended that the fire detection be a load bell alarm located at the manned station or in the control room.
3.
The existing valving arrangement for the orotection of the auxiliary building backup exhaust filters (item m. of the Tech Specs) is complicated. Each unit has a bank of fopr valves.
It requires the opening of these valves and the opening of the valve at the control panel mounted on the wall of the outside of the building to activate a fire suppression system. The installed valves are not of the rising steam type making it difficult to recognize at a glance whether they ase in the open or closed position. It is recommended that because of the complexity of the system the fire
~
brigade be schooled immediately in the procedure requirements for actuating the fire suppression system and that periodically they be required to practice these procedures. It is also recommended that the valves be tagged in the closed position and that they be inspected periodically to verify that they are in the closed position.
4.
It has also come to our attention that as a result of an earlier fire l
protectia a plant survey certain modifications to the fire protection 5
systen we:e recommended. However, the due date for these modifications was to be: prior to startup following the first refueling. In light of the exiecing conditions that due date is unrealistic. It is suggested that t!.ese modifications be reexamined and those found pertinent be implemented as soon as pnasible.
Due to the safety significance of these observations it is requested that you take immediate action to implement the recommendations noted above.
We would appreciate a response within one week from the date of the letter indicating those actions that have been completed and a schedule for completing the rest.
We are prepared to meet with you and your staff to discuss the comments in more detail if you beliave a meeting would be desirable.
Sincerely,
- '" 9 9 2 259
/s/u John T. Collins, Deputy Director
.T:!I-2 Support JTCollins:cj cc:
J. Herbein, Met-Ed,IIail Stop 120
- 11. Greenberg CS/21/79 T. O' Conner, lict-Ed, Itail Stop Eng. 2 J. Ucrmiel D. Eisenhut H. Denton R. Vollmer R. Fitzpatrick