ML20147D727
| ML20147D727 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/26/1988 |
| From: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 4410-88-L-0026, 4410-88-L-26, NUDOCS 8803040116 | |
| Download: ML20147D727 (3) | |
Text
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Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
(717) 948-8461 February 26, 1988 4410-88-L-0026/0358P US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Dear Sirs:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Criticality Safety Assessment For Use Of the Plasma Arc Torch To Cut the Lower Core Support Assembly NRC Letter NRC/TMI-88-006 dated February 17, 1988, submitted comtrents on the subject safety assessment which was submitted for NRC review and approval via GPU Nuclear letter 4410-87-L-0139 dated November 30, 1987 Attached are GPU Nuclear responses to the NRC coments.
Sincerely, w
- F!R.Standerfer Director, TMI-2 emf Attachment cc: TMI-1, NRC Resident Inspector - R. J. Conte Regional Administrator, Region 1 - W. T. Russell Director, TMI-2 Cleanup Project Directorate - Cr. W. D. Travers h5hhh320 hh, /
g DCD GPU NL;Iear Loir.otion is a subsidiary of *he General Pubhc Utilities Corporation
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ATTACHENT 4410-88-L-0026 NRC COMENT 1 e '; vide additional detail regarding the maximum of three gallons leakage of unburated torch coolant.
a.
Provide a volume table giving the location of the unborated water inventory, i.e., tank (s), lines, pump, b.
Describe the test that was performed to obtain 3.45 gallons.
GPU NUCLEAR RESPONSE la. The following is a tabulation of the calculated volumes of various components in the plasma arc torch coolant system.
Coolant Hoses - Plasma Junction Box to Torch 1.42 Three Heat Exchangers at 0.25 gallons each 0.75
- Coolant Reservoir - Top Tube 0.20 Plasma Torch Body 0.10 Pump Suction Piping 0.05' Filter 0.05 Coolant Hose - E-200 to Junction Box 0.60 New Stand Pipe 0.40 TOTAL T.T7 gallons Additionally, there is-a fill / flush tank limited to 15 gallons by an overflow hose. This tank is disconnected from the E-200 system. prior to operation, lb. The E-200 unit with plasma junction box, bouy can (which is part of the volumetric inventory of the coolant hoses), and torch were connected and filled with water until the stand pipe overflowed. The E-200 was then mounted and all hoses and the torch were positioned below the HE-200 to ensure drainage. The torch was positioned approximately 41 feet below the base plate of the HE-200. The coolant circulating pump was started with the shutoff float switch defeated. The torch head was unscrewed and the system was allowed to drain into a graduated container. The test was conducted with Quality Assurance (QA) Department oversight.
Two tests were performed. Test #1 drained 3.41 gallons and test #2 drained 3.46 gallons. Note that the calculated voltrne was 3.57 gallons.
NRC CO M NT 2 Describe your system which assures that the voltrne of these components will be maintained within the maximum allowed.
- w ATTACHENT
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4410-88-L-0026 GPU NUCLEAR RESPONSE The QA Department witnessed the draindown testing. QA also measured and verified water volumes and component sizes in the test. The bill of materials of the water containing parts of the system also was verified. The conponents used in the test will be the actual components installed in the Reactor Building. Water containing parts are classified Important to Safety (ITS) for coolant volune only, thus, the volune of replacement components in thr3 plasma arc torch coolant system will be controlled.
NRC COME NT 3 Describe your system to preclude misalignment of the 15 gallon tank during operations including any independent verification required.
GPU NUCLEAR RESPONSE The operating procedure will include a signed verification by the on-duty Fuel Handling Senior Reactor Operator that the 15 gallon tank has been disconnected from the HE-200 unit. This verification will be performed prior to operating the HE-200 unit and prior to flushing the system. Prior to initially filling the 15 gallon tank, the QA Department will verify that the overflow hose, the supply hose to the HE-200 system, and the drain hose from the HE-200 system to the Fuel Transfer Canal have been properly routed and secured. Additionally, the length of the drain hose for the HE-200 system is not long enough to reach the top elevation in the Intemals Indexing Fixture. These controls should preclude the possibility of flush (i.e., non-borated) water being introduced into the fuel debris in the Reactor Vessel.
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