ML20063N653
| ML20063N653 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/29/1982 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 5211-82-232, NUDOCS 8210050113 | |
| Download: ML20063N653 (4) | |
Text
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GPU Nuclear Corporation G U AUClear 2s'one "1
- te so Middletown, Pennsylvania 17057 717 944 7621 TELEX 84-2386 Writer"s Direct Dial Number:
Septaber 29, 1982 5211-82-232 Office of Nuclear Reactoe Regulation Attn:
J. F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Deir Sir:
Three Mile Island Nuclear Station, Unit 1 (Dil-1)
Operating License No. DPR-50 Docket No. 50-289 Phase 1 Ventilation Separation Program The supply and exhaust ventilation system for D11-1 Fuel llandling Building (FHB) are separate from those of D11-2 except for the fuel handling floor which communicates directly with TMI-2.
Because of the common FHB crane and other compor.ents, physical separation of the D11-1 and TMI-2 fuel hand-ling area was not feasible. To provide equivalent protection and meet the short term incent of Order Item 4, GPUN committed to modify the FHB as follows:
1.
Isolate the TMI-1 fuel handling floor from the TMI-l Auxiliary Building (AB) by an environmental barrier to eliminate potential uncontrolled leakage paths.
2.
Install three leak tight isolation dampers in the FHB supply and exhaust ducts to prevent air leakage between the FliB Refueling Floor and Auxiliary Building via their respective ventilation systems.
In the event of high radiation in the Fuel Handling Building, the TMI-l FHB would be automatically isoltted from the DlI-l AB by stopping the FHB supply fan and closing the inlet and exhaust isolation dampers. However, subsequently these dampers could be opened and air flow re-established at the discretion of the plant operators.
Further details concerning these modifications are discussed in the TMI-l Restart Report Supplement 1, Part 2, Question 52.
00l 8210050113 820929 PDR ADOCK 05000289 P
pop GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
Mr. J. F. Stolz 5211-82-232 As discussed in paragraph 1267 of the Partial Initial Decision dated December 14, 1981 the ASLB agreed with the Commonwealth of Pennsylvania finding that a program should be designed to test the adequacy of the Phase 1 ventilation operation program. Attached is an outline of that program. The test program has been completed with satisfactory results and the system has been turned over to Plant Operations.
Sincerely,
'll H. D.11ukill Director, TMI-1 IIDil:PdS:vj f Attachment cc:
R. C. Ilaynes R. Jacobs
ATTACHMENT TO 5211-8 32 t
Phase I Ventilation Separation Test Program f
The Phase 1 ventilation separation test program is composed of a number o' individual tests.
1 j
I.
Environmental Barrier Integrity Test A,
Purpose - To visually inspect the environmental barrier to ensure u
adequate integrity to minimize air flow between the AB and FHB.
jb, Test - A quality control inspector has visually inspected the environmental barrier for any design deficiencies C.
Results - The visual inspection was completed on 7/30/82 with no major deficiencies noted.
II.
Auxiliary and Fuel Handling Building Ventilation Isolation Dampers -
Cycling, Pressure Drop and Leak Tightness Test (Shop Tests).
l A.
Purpose - To demonstrate the leak tightness of the 3 dampers installed in the AB/FHB Ventilation System.
B., Test - Cycling testsof each damper from full open to full closed for a minimum of 25 times were conducted by the canufacturer.
Pressure drop test through the open damper in accordance with AMCA 500 requirements to show that a limit of 0.2 inches of uater at 2500 ft/ min air velocity through the damper is not exceeded.
The dampers were leak tested in the fully closed position in accordance l
with the requirements of ANSI N 509 Section 5.9.7 and Table 5 - for leakage Class II dampers.
C._ Results - Following correction of a number of deficiencies associ-ated with the dampers, the tests were satisfactorally completed on Jely 21, 1981.
f III. Auxiliary and Fuel Handling Building Ventilation Isolation Dampers -
Control Logic Operability Test Au, Purpose - To demonstrate the operation of ventilation isolation i
dampers control logic circuitry, i
B.
Test - The test involved the development of a test procedure (TP 250/2.1) which outlines the various check points and details of these tests:
1.
Damper isolation - local control station operations.
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2.
Damper isolation - Control Room operation 3.
Damper isolation - dummy signal from RM-G9 and RM-A4 which automatically trips the supply fan AH-E-10 and closes dampers AH-D-120, 121 and 122.
& Results - The test was completed on June 9,1982 with satisfactory results.