ML19319D001
| ML19319D001 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear, Crystal River, Midland, Crane  |
| Issue date: | 07/09/1975 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Goller K Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19319C975 | List: |
| References | |
| IE-C&O-75-14, NUDOCS 8003040929 | |
| Download: ML19319D001 (1) | |
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Drite : JUL 9 1975 Serial No.: lE-C&O-75-14 TRANSFER OF LEAD RESPONSIBILITY To:
K. R. Coller, Assistant Director for Operating Reactors, RL
Subject:
Possible Deficiency in Performance of the Thiosulfate Reactor Building Spray System Facilities: Arkansas Nuclear One-1, Crystal River 3, Midland 1 & 2, and Three Mile Island 1 & 2 Responsible Branch Chief:
K. V. Seyfrit Description of Item Requiring Resolution:
reported that analysis of the hydraulic performance Babcock and Wilcox has of the reactor building spray system using a newly developed ccmputer code.
"Symmet 2," has revealed that the sodium hydroxide and the sodium thiosulfate tanks empty before the borated water storage tank. As a result, there would be no hydroxide or thiosulfate in the reactor building spray ' system until the pump suction is switched to the reactor building pw::p. Allowing five minutes for operator action, the spray system could be without hydroxide or thiosul-fate for as long as 21 minutes.
This appears to represent a significant deviation from the performance specified in the FSAR (6.2.2.1) in that the two chetical a3ditive tanks and the borated water storage tank do 'not draw down together under calculated accident conditions. This deviation in performance could result in either or both of the following adverse effects following a LOCA:
1.
The analysis of radiation releases for an individual plant may show that off-site doses are higher than those presented in the FSAR.
2.
The pH of the reactor building spray solution may, for a short period, exceed the value of 9.5 stated in Babcock aod Wilcox Topical Report BAW-10017, Rev. 1. " Stability and Compatibility of Sodium Thiosulfate Spray Solution - R&D Report (Proprietary)."
lE is also concerned'that when the hydroxida and the thiosulfate tanks become empty that air could enter the spray pump suction, the low pressure injection pump suction, and possibly cause pump damage due to cavitation.
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