ML20085D218

Change Request 8 to Application for Amend to License DPR-4, Changing First Sentence of Item 11(c) on Page 10 of Tech Specs

ML20085D218
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	04/29/1963
From:	Neidig R SAXTON NUCLEAR EXPERIMENTAL CORP.
To:
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References
FOIA-91-17 NUDOCS 9110150343
Download: ML20085D218 (3)

Text

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SAXTON NUCLEAR EXPERIXENTAL CORPORATION l l

DOCKET NO. 50-lh6 LICENSE DPR-h CHANGE REQUEST #8 i

1. Applicant hereby submits Change Request #6 in compliance with paragraph 3 of License DPR-h.

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I SAXTON NUCLEAR EXPERIMENTAL CORPORATION l

l By /s/ R. E. Neidig President Attest:

(S E A L) /s/ R. E. Sypher Secretary Sworn and subscribed to before me this 29th day of April, 1963.

~~ /o/ Martin A. Kohr (S E A L) Notary Public 911015034~3 910424 h hlenberg Township, Berks County PDR FOIA My Corr.ission Expires Feb.. h,1966 DEKOK91-17 PDR

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e Airil 26, 1963 Donket No. 50-lh6 DPR b Technical Specifications Change Request #6

3. Description of Change Change first sentence in item 11(c) on page 10 of the Saxton Technical Specifications to read as follows:

(c) In the event of a rupture of any part of the main coolant system and a resultant loss of coolant, a safety injection system is provided to keep the core covered with water containing enough bcric acid to maintain the core suberitical by at least 10% k at ambient temperature with all control rods it.serted.

2. Purpose of Chance During a review of technical specifications by Saxton Nuclear Experimental Corporation personnel, the question was raised as to whether the words "approximately 1% boric acid" as now written in the Technical Specifications can be construed to be approximately 1200 ppm (close to two thirds of 1%), the concentration we have maintained in the refueling water storage tank. During refueling, or any operation with the reactor vessel head removed, the reactor storage well must be borated for at least 10% shutdown of the core with all control rods inserted. Boration to a higher degree would give more shutdown margin but would also cause deadening of nuclear instrumentation response during fuel addition. Therefore, it is not desirable to have h00 or 500 ppm boron greater than is needed for 10% shutdown. This same water that is used to fill the reactor storage well is maintained in the 80,000-gallon refueling water storage tank during normal operation of the reactor plant and is thus the water which would be pumped into the main coolant system by the safety injection system in the event of a rupture of any part of the main coolant system and a resultant loss of coolant pressure.

3 Safety Considerations There are three pertinent safety considerations to consider when ktermining boric acid concentration in the 80,000-gallon refueling water storage tank.

1. Adequacy of shutdown margin for fuel handling operations.

2. Effect of concentration on nuclear instrumentation.

3 Adequacy of shotdown margin during operation when safety.

injection system will inject this water into the primary system in the event of a system rupture that would drop the system pressure below 1000 psi.

The concentration of approximately 1200 ppm that we have maintained has been determined experimentally to give more than 10% shutdown with all rods inserted in a new core at ambient temperature. In our opinion the proposed change does not present significant hazards considerations not described or implicit in the Final Safeguards Report.

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' April--26, 196)

' Docket No. 50-1L6 DPR-b Technical Specifications Chan;;e Request #8 (page 2 of 2) 4

h. Health and Eafety It is our conclusion that the health and safety of the public will not be endangered by this change.

5 Schedule Approval of this change is requested by June 1,1963 s

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