ML20085D375

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Change Request 9 to Application for Amend to License DPR-4, Changing Hydrogen Concentration from 25-35 Cc/Kg to 15-90 Cc/Kg
ML20085D375
Person / Time
Site: Saxton File:GPU Nuclear icon.png
Issue date: 10/21/1963
From: Neidig R
SAXTON NUCLEAR EXPERIMENTAL CORP.
To:
Shared Package
ML20083L048 List: ... further results
References
FOIA-91-17 7082, NUDOCS 9110160125
Download: ML20085D375 (4)
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s 4 1 SAXTON NUCLEAR EXPERIMENTAL CORPORATION DOCKET NO. 50-lh6 LICENSE DPR-b Change Request No. 9

1. Applicant hereby submits Change Request No. 9 in compliance with paragraph 3 of License LPR-h.

SAXTON NUCLEAR EXPERDdINTAL CCRPORATION By, /s/ R. E. Heidir.

President

Attest

(S E A L)

/s/ R. E. Sypher Secretary Sworn and subscribed to before me this 2M day of October 1963

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'. October 18, 196)

Docket No. 50-1L6 DPR-b Technical Specifications Change Request No. 9 (Page 1 of 2 pages)

1. Descripticn of Change

! Paragraph h(b), page 2 - change hydroCen concentration from 25-35 cc/Kg to read 15-90 cc/Eg and change (2-3 ppm) to read (1.2-7.2 ppm).

2. Purpose of_ Change, The technical specification range for hydroCen is small, making it extremely difficult to maAntain, Changes in nressurizer level cause the partial pre * *ure of hydrogen inside the pressurizer steam volume to change, and thus the 4., drogen concentration in the main coolant loop changes since there is always a small amount of spray flow thrcugh the pressurizer. A wider range of hydrogen concentrations in the nain coolant would pernit more latitude in pressurizer level changes which are necersary in condu: ting our experimental program.

3 Safety Consid_eratiens Since other reactr.rs have dcmorstrated that 15 ce/Fg of hydrogen is a

! sufft:1ent amount to maintain crygen levels at or belew 0.1 ppm, a lcwer limit of 15 cc/KC is reastnable.

l At 90 cc/Kg, the nain coclant would contain 2h ft 3 of H2 and assuming I twice thu amount in the presrurizer gas phase, the total hydrogen in the systen would be 72 ft3 . If this amount of hydrogen were to escape into the rmallest enc 1cred compartment (reacter ecmpartment) which has a free volume of 7500 ft3 l of air, the hydrogen concentration w:uld be approximately .96%, which is well l

below ths explosive limit cf L%. Also, this cempartment and the containment vessel operating area are pericdi ally checked for hy&* ogen concentration during l

operatics by valving arrangemer.ts provided for this purpose, although the centrol rod roem is smaller in volume than the reactor compartmtat, the rod room has a 12-inch vent pipe which vents to the auxiliary compartment which is epen to the operating area. Thus any system leakage into l

the rod root would flash into steam, causing a pressure increase in the red l

room, and rod room vaper wculd flew frcm the tcp of the rcom out the open 12-i inch vent pipe to the auxiliary ecmpartment, carrying hydregen cut of the rod

_ room. This .would prevent a buildup of hydrogen in the rod room.

It is recognized that a large total gas inventory a ,uld cause free hydrogen pocketing problems during cold maintenance or main alant pump operation. The normal shutdown and cooldown procedure for tne Saxten reacter plant specifies that hydrogen will be removed during cooldown, if the primary system is going to be opened up for maintenance. The normal plant startup-procedure specifies that the main coolant pump will be vented prior to pump cperation, if the reactor plant has been cooled down and depressurized.

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October 18, 1963

' Docket No. 50-lh6 DPR-b Technical Specificatient Change Requent No, 9 (Page 2 of 2 pagee)

In our opinion, the proposed change does not present significant hazards censiderations not acecribed or ifeplicit in the Final Safeguards Rept r%

b. Health and Safety It is our conclusion tnat *.ht health and safety of the public will not be endangered by this change.

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