ML20147C017

Provides Requested Verification by Computer Simulation of Sys Re Tech Specs Change to Delete Sodium Thiosulfate from Reactor Bldg Spray Sys.Requests Expeditious Review of Attach Drawdown Test Data.W/Att Comparison of Tests

ML20147C017
Person / Time
Site:	Arkansas Nuclear, Crane
Issue date:	12/13/1978
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
1-118-9, NUDOCS 7812180120
Download: ML20147C017 (6)

Text

{{#Wiki_filter:. ARKANSAS POWER & LIGHT COMPANY POST OFFICE DOX 551 UTTLE ROCK, ARKANSAS 72203 (501)371 4000 December 13, 1978 1-118-9 Director of Nuclear Reactor Regulation ATTN: Mr. R. W. Reid, Chief Operating Reactor Branch #2 U. S. Nucicar Regulatory Commission Washington, D. C. 20555

Subject:

Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51 Technical Specification Change to Delete i 4 Sodium Thiosulfate from the RBSS. (File: 1511.1) Gentlemen: Your 1ctter of October 17, 1978, indicated that the staff had completed its review and evaluation of our proposed changes to the Arkansas Nuclear One - Unit 1 (ANO-1) Technical Specifications and to the ANO-1 Reactor i 4 Building Spray System (RBSS) and had found them acceptable provided the q' computer simulation data can be verified. Verification of this data, submitted for the gravity feed from the Sodium Hydroxide Tank and the Borated Water Storage, has just been completed. We hereby provide the requested verification by comparison of a compv* simulation of the Three Mile Island - Unit 2 (TML-2) system and their actual drawdown test data. The TMI-2 system is similar and representative of the ANO-1 system. As shown in the attached report, the uncertainties introduced by the modeling technique and conservative and insignificant and the correlation between test data and calculations is very close. We feel that Bechtel's HYDRA code adequately predicts the hydraulic per-formance of the RBSS at ANO-1, and that further demonstration by means i of a drawdown test is not necessary. Based on conversation with your staff, we believe approval of our December 6, 1977, submittal to be feasible by January 12, 1979. We request your expeditious review and completion of this item by that date in order that we might support implementation during our upcoming refueling outage. Very truly yours, 4 THIS DOCUMENT CONTNNS POOR QMITY PM3 p k.1 J ~ ~ Daniel H. Williams Manager, Licensing THIS DOCUMENT-CONTAINS /y DHW: ERG:bao 1 Attachment ""S ( 7 8131801 do p umorn u,oon soum unums svsTru

i t ARKANSAS NUCLEAR ONE - UNIT 1 COMPARISON OF HYDRA PREDICATIONS WITH THREE MILE ISLAND - UNIT 2 (TMI-2) TANK DRAWDOWN TEST

===1. Background=== In response to NRC questions and in order to justify deleting Sodium Thiosulfate as a spray additive, a hydraulic analysis of the Reactor Building Spray System (RBSS) was performed. This analysis utilized a computer program (HYDRA) devc?oped by Boeing Corporation for analyzing incompressible flui1 flow networks. =The flow' rates for NaOH' and borated water were then l used to determine the spray pH. t The validity of the flow calculations has been questior.ad by the NRC and the NRC has requested that a test of the modified ANO-1 system be performed. As an alternative to a test, the NRC suggested that HYDRA could be used to model a system already j tested and the calculated results compared to the test results. The latter approach has been taken, utilizing tank drawdown test performed at the TMI-2 plant. II. HYDRA Calculation The TMI-2 piping arrangement was modeled for HYDRA using the same methodology used for ANO-1 (see Figure 3). Only the suc-tion side of the pump was modeled because complete data was not available for the pump discharge path. This is considered adequate because the solution pH depends only on the relative flow rate f rom each tank and not on the magnitude of the total flow rate. The results of the TMI-2 test and the HYDRA calculation are shown on Figures 1 and 2. As can be seen from these figures, the agreement between HYDRA and the test results is excellent. Because the magnitude of the NaOH flow is about 200 gpm versus the approximately 5,000 gpm flow from the BWST, the small errors present appear as a larger percentage on the NaOH level versus time plot. However, at no point is the average error greater than 2% in level or flow rate (% per minute). .j = j III. Conclusions I A 2% crror: in the flow rbte of NaOH would have a negligible 'effect on the pH of the spray solution (a 10% error only [ changes pH by abcut 0.'2). Therefore, it is concluded that the HYDRd. code adequately predicts the hydraulic performance of a piping ' network / reservoir system and that a drawdown test at ANO-1 is not necessary. f L U y'-' 3 + 'XY i w g { l l l l

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