ML19344B297
| ML19344B297 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/22/1980 |
| From: | Hovey G METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-05, IEB-80-5, TLL-381, NUDOCS 8008260391 | |
| Download: ML19344B297 (3) | |
Text
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Metropolitan Edison Company
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[h-Post Office Box 480 Middletown, Pennsytvania 17057 717 944-4041 Writer's Direct Dial Number August 22, 1980 TLL 381 Office of Inspection and Enforcement Attn:
Mr. Boyce H. Grier, Director Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Sir:
Three Mile Island Nuclear Station, Unit 2 (.TMI-2)
Operating License No. DPR-73 Docket No. 50-320 I.E.Bulletin 80-05 This letter is submitted as a result of the requirements of IE Bulletin 80-05 and subsequent to our letter of July 9, 1980 (TLL 335).
The subject bulletin requires a design review of all syste=s that contain low pressure tanks or hold-up tanks which can be valved to contain primary system water. The intent of the review is to ensure that the subject tanks are adequately protected from vacuum condition of a large enough magnitude to buckle the tanks. Such a review has been performed. The results and appro-priate corrective actions are tabulated in Attachment 1.
The results showed that of the thirty (30) Unit 2 tanks encompassed by this review, twenty-eight (28) are adequately protected from buckling due to vacuum conditions created inside the tank. The following is a synopsis of Attachment 1.
Of the thirty (30) tanks:
1.
Three.(3) are maintained at a positive pressure. Therefore, no l
corrective action is necessarv.
2.
Seven (7) are vented to atme, i fia lines which contain isolation valves; however, procedural
,atrols maintain these valves in the open position. No corrective action is necessary.
3.
Two (2) are protected with vacuum breakers. No corrective action is necessary.
4.
Nine (9) are vented to atmosphere via vent lines which have no means of isolation. No corrective action is necessary.
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5.
Two (2) tanks are of a design that is capable of withstanding a full
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vacuum. No corrective action is necessary.
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l 6.
Five (5) have drain pumps with interlocks that shut down the pumps l
l upon receipt of a low suction pressure signal. No corrective action is necessary.
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Metrecentan Ec sen cemeany.s a uen cer et tre Genera + Pa nc urit.es sys em
B. H. Grier TLL 381 7.
Two (2) tanks will have their associated pump controls modified to include an interlock to shut down the pump upon low pressure in the tank. The setpoint of the trip will be such that there is an adequate margin between cut out pressure and the pressure at which the tanks are expected to buckle.
The expected date of installation of the above interlocks is November 1, 1980.
The above review covers low pressure or holdup tanks capable of holding primary system water. In addition, it includes all IMI-2 tanks which do or could possibly contain contaminated water. The review satisfies the indicated scope of the bulletin, but also satisfies our understanding of its intent, as applied to TMI-2.
Sincerely,
/s/ G. K. Hovey G. K. Hovey Director, TMI-2 GKH:SDC: dad Attachment cc:
J. T. Collins l
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L TLL 381 CATEGORY' NO. OF TANKS 1
2 3
4 5
6 7
TANK Core Flood Tanks (CF-T-1 A/B) 2 X
1 X
Make Up Tank (HU-T-1)
Boric Acid Mix Tank (CA-T-1) 1 X
Reactor Coolant Drain Tank (WOL-T.3) f I
X Neutra11rer Tanks (WOL-T-8 A/B) 2 X
Evaporator Condensate Test Tanks 2
X (WOL-T-9 A/B)
Contaminated Drain Tanks 2
X (WDL-T-ll A/B)
Epicor !! - Clean Water Receiving Tank 1
X (CC-T-2)
Epicor II - Of f Spec. Water Receiving Batch Tank (CC-T.1) 1 X
Tank Farm - Waste Storage Tanks (WG-T.1 A/B) 2 X
Tank Farm - Waste Storage Tanks 4
X (WG-T-2 A/B/C/D)
Borated Water Storage Tank (DH-T-1) 1 X
Sodium Hydroxide Storage Tank (DH-T-2) 1 X
Spent Resin Storage Tanks (WDS-T-1 A/B) 2 X
Reactor Coolant Bleed Hold-up Tanks (WDL-T-1 A/B/C) 3 X
Miscellaneous Waste Holdup Tank X
1 (WDL-T-2)
Auxiliary Building Sump Tank (WOL.T.5) 1 X
Concentrated Waste Tank (WDS-T-2) 1 X
Reclaimed Boric Acid Tank (WDS-T-3) 1 X
Below are the categories into which each of the tanks m
have been grouped. For tanks in categories 1 through 6 no corrective action is necessary to prevent inward buckling.
1.
Tanks are maintained at a positive pressure.
2.
Tanks are vented directly to atmosphere.
3.
Tanks are vented to atmosphere through isolation valves which are maintained in the open position.
4 Tanks are protected with vacuum breakers.
5.
Tank design external pressure exceeds 14.7 psi.
6.
Pumps which draw from these tanks are interlocked to trip on low suction pressure, 7.
Action will be taken to install interlocks to trip tank drain pumps on low tank pressure.
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