ML19262A282

Discusses Reanalysis of Drawdown Performance of TMI-1 Reactor Bldg Spray Sys & Confirms Performance of Sys within Criteria Outlined in FSAR in Response to

ML19262A282
Person / Time
Site:	Crane
Issue date:	10/13/1975
From:	Arnold R METROPOLITAN EDISON CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
GQL-1606, NUDOCS 7910260612
Download: ML19262A282 (6)

Text

{{#Wiki_filter:NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL

• (TEMPORARY FORM) i CONTRCL NO:

1W FILE: F ROM : Me t. Edison Co. DATE OF DOC DATE REC'D LTR TWX RPT OTHER Reading, Pa. 19603 R.C. Ar.old 10-13-75 10-16-75 XX TO: ORIG CC OTHER SENTimC PDR 'A Mr. Robert Reid 1 sign,ed SENT LOCAL PDR XX CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO: XXX 1 50-239 DESCRIPTION: Ltr re their 9-8-75 ler....furn ENCLOSURES: info on the drawdown performance of the Three Mile Island Unit 1 (TMI-I) deactor Building Spr: y System & confirm that it==eets with FSAR requirements & vith attachment's 1 & 2.... PLANT N AME: Three Mile Island Units 1 FOR ACTION /INFC RMATION DHL 10-20-75 BUTLER (L) SCHWENCER (L) ZIEMANN (L) REGAN (E) % Ip(L) W/ Copies W/ Copies W/ Copies W/ Copies W/(pCOPIES CLARK (L) STOLZ (L) DICKER (E) LEAR (L) W/ Copies W/ Copies W/ Copies W/ Copies PARR (L) VASSALLO (L) KNIGHTON (E) SPIES W/ Copies W/ Copies W/ Copies - W/ Copies KNIEL (L) PURPLE (L) YOUNGBLOOD (E) 4.PM 3 R*d gso s W/ Copies W/ Copies W/ Copies W/popies e INTERNAL DISTRIBUTION FG FIA TECH REVIEW DENTON LIC ASST A/T IND. . RC PDR SCHROEDER GRIMES R. DIGGS (L) BRAITMAN WDGC, ROOM P 506A MACCARY GAMMILL H. GEARIN (L) SALTZMAN GOSSICK/STAF F KNIGHT KASTN ER E. GOU LBOURNE (L) MELTZ CASE PAWLICKl BALLARD P. KREUTZER (E) GIAMBUSSO SHAO SPANGLER J. LEE (L) PLANS BOYD STELLO M. RUJHBROOK(L) MCDONALD MOORE (L) HOUSTON ENVIRO S. REED (E) CHAPMAN DE. YOUNG (L) NOVAK MULLER M. SERVICE (L) DUBE (Ltr) SKOVHOLT (L) ROSS DICKER S. SHEPPARD (L) E. COUPE GOLLER (L) (Ltr) IPPOLITO KNIGHTON M. SLATER (E) PETERSON P. CO LLINS TEDESCO YOUNG BLOOD H. SMITH (L) HARTFIELD (2) DENISE J. COLLINS EGAN S. TEETS (L) KLECKER REG OPR LAIN AS OJECT LDR G. WILLI AMS (E) EISP.NHUT efFILE & REGION (2) BENAROYA V. WILSON (L) WIGGINTON MIPC VOLLMER k 4@_ESS 641. IN G R ' S4 ( L) M. DUNCAN m EXTeii4N AL DISTRIBUTION 84 - LOCAL PDR Harrisburg, Pa. M - TIC (ABERNATHY) (1)(2)(10) - N ATION AL LA BS 1 - PDR SAN /LA/NY $4 - NSIC (BUCHANAN) 1 - W. PENNINGTON, Rm E 201 GT 1 - BROOKHAVEN NAT LAB 1 - ASLB 1 - CONSU LTANTS 1 - G. ULRIKSON ORN L 1 Newton Anderson NEWM ARK /BLUM E/AG B ASI AN ACRS 99W99Ne=SENT '7b g,,g 4g4 Nb f N79102eog/g jo

Y$ m. '/".',' omere m nocerst METROPOLITAN EDISON COMPANY AcST CFFICE box 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-2601 Ceteber 13, 1975 GO,L 16C6 f .(iT ; i;, .%., W j '. i Director of Nuclear Reacter Regulation 99,]'~' [ A? "I: Mr. Ecbert '4. Reid, Chief -~. 2; u Cperating Feacters Branch #h r, Division of Reacter Licensing 'O U. S. Nuclear Regulatory Cc=missicn /h ~ b O N' ~4ashingten, D.C. 20555 ~ < - - Dea" Mr. Reid: Operating License No. DPR-50 Docket No. 50-289 By letter dated September 8,1975, Metropolitan Edison Company (Met-Ed) was requested to reanalyze the dravdcun performance of the Three Mile Island Unit #1 (TMI-1) Reacter Building Spray Syste= and confirm that the system vill perform within the criteria stated in the FSAR. The results of our reanalysis have been ccepleted and are discussed below. The design performance characteristics for the O!I-1 Reacter Building Spray System are described in Section 6.2.2, Section ik.2.2.3 and Supplement 1, Part I of the TMI-l FSAR. The basic cbjectives established during the design of this system were that:

1) during dravdown the spray solution centains abcut 3.5 percent weight Sodium hicsulfate at a pH of about 9.5, and

2) sufficient Sodium Thicsulfate and Sodium Hydroxide be injected by the Building Spray System and E=ergenc7 Core Cooling Systers to establish an initial Peactor Building su=p condition of 1", by weight Thiosulfate at a pH cf approximetely 9 5 The dose calculations presented in the TMI-l FSAR do not take credit for thicsulfate solutien cencentrations greater than 1% vt.

In crder to meet the above objectives, the piping configuratien was based en Dall flev conditions (i.e. cperation of all engineered safeguards equipment). These flow ccnditiens were selected since they established the minimum concentratica and a cunt of thicsulfate and hydroxide which could be delivered and since they were censidered to represent the = cst likely cenditiens which vculd exist under accident conditions. During the 3:I-1 Start-up and Test Progra=, a dravicvn test was perferred te veriP/ proper dravdevn under full flav ccnditiens. Pure veter was used in teth 7 .O R C -vu lab 4 327

. the thicsulfate tank and hydroxide tank since it was not feasible to use the actual solutiens. This test did not indicate any deficiency with the TMI-l piping lay out in that, as expected, the Scrated Water Stcrage Tank emptied prior to the thiosulfate and hydrcxide tanks. Subsequently, we and cur consultants have develcred a computer progra: to calculate the dravdevn performance of the thicsulfate, hydroxide, and Scrated Water Storage Tanks. The original Start-up and Test data vere used to verify the sub;ect program. Using the pregram discussed above, the hydraulic performance of the Building Spray System has been reanalyzed. Figure 1 presents the predicted perfcrmance under full ficv conditions and Figure 2 presents the predicted performance under single f ailure ccnditions (i.e. half flow). These figures are based en the folleving conditions and assumptions:

1) The thiosulfate tank centains 30% vt. sodium thicsulfate and 15 vt.

beric acid buffered to a pH of 10.

2) The thicsulfate tank initial level is 1.5 ft. belev the tank lev level alar =.

3) The sodium hydroxide tank contains 21.6% vt. of hydroxide at an initial level within 0.5 ft. of the tank high level alarm.

h) The Borated Water Storage Tank contains the minimum quantity cf borated water permitted by Technical Specificatien at the minimum permitted cen-centration of 2270 pp: bcron.

5) The Building Spray pumps and the Decay Heat Removal pumps are operating at the minimum flev rate permitted by TMI emergency procedures. The high pressure injection pumps are not operating.

The above parameters and assumptions are considered to provide conservative values for minimum thicsulfate concentraticns, taxi =un pH conditions, and mismatch in dravdcun times. Based en the results of Figure 1, it has been deterrined that during dravdevn the building spray will contain 3.55% vt. thiosulfate. The spray solution vill reach a maximum pH of 10 3 which vill only exist for abcut 23 minutes. The reactor building sump will initially contain 0.92% vt. thicsulfate at a pH cf 9.6. Furthermore, as indicated on Figure 1, the thicsulfate and hydroxide tank vill empty about 3 minutes prier to establishing flow frem the reacter building surp. For the half flev conditions of Figure 2, the spray solution vill contain 3.c9% vt. thiosulfate and reach a maximum pH of 10.8 which vill only exist for abcut 30 minutes of the dravdcvn. The thicsulfate and hydroxide tank empty in about 16 and 10 =inutes, respectively, prior to establishing ficv frc= the reactor building sump. The initial sump conditions vill be the same as abcVe. Based en the above reanalysis of the hydraulic performance cf the 3uilding Spray System, it is concluded that the as-built TMI-l system performs within the criteria stated in the FSAR. This conclusion is based cn: 1484 328

. 1) Parameter studies conducted on a typical reacter building indicate the lack of thicsulfate in the spray solution for 16 minutes and the slightly reduced su=p thicsulfate cencentration vill only result in an increase in the tyc-hcur thyroid dose of abcut 65.

2) The sodium thiosulfate concentraticn during the initial injection phase is always greater than the 1.0 veight percent assumed in the FSAR analyses.

If credit were taken for the =cre realistic initial spray solution ec=pesition, the two-hcur thyrcid dose vould iecrease ab out 1. 5 %.

3) The lack of thiosulfate in the spray solution occurs at a time in the Loss of Coolant Accident when the reacter building pressure has been reduced significantly. Therefore, containment leakage and resulting expcsures will be less than those assumed in the FSAR accident analysis during this time.

h) For 6 minutes cut of the 16 minutes during which thicsulfate vill not exist in the spray solution under half flev conditiens, sodium hydrcxide vill still be present. Since hydroxide is alcest as effective in removing elemental iodine as thiosulfate, the dose effects discussed in (1) above are censervative.

5) The effect of spraying 0 92 weight percent sodium thiosulfate while recirculating frem the sump vill have negligible effect en the thirty day thyroid dose. Calculations performed by B&W for a typical set of parameters at a typical plant indicate that reducing thiosulfate concentration to 0.82 weight percent increases the thirty day thyroid dose by abcut 1.L%.

Ecvever, if credit is taken fer the higher con-centratiens which exist during the initial injection, the thirty day thyroid dose vculd decrease by about 7.0%.

6) The protective coatings have been qualified for long ter= expcsure at a pH of 9.5 Short exposure of 30 minutes at a pH cf 10.8 is not cen-sidered to be a significant extrapolatien of the existing test data and, therefore, no degradatien cf the coating systems is expected.

We have evaluated the matter of pctential pu=p damage due to cavitaticn resulting frem mismatched dravdowns. Neither the start-up and test data ner our ec=puter calculations indicate that any cyphening effect en the thicsulfate er sedium hydrcxide tanks occur. As a result, ence these tanks dravdcvn to the bettc= of their auction no::le, static flow eenditions in these lines will be approached and a nearly static h ead of water vill be maintained in the tank discharge lines. Therefore, no pump cavitation vill occur. In surrary, our evaluaticn of the hydraulic performance of the TMI-l Reactor Building Spray system has established that the syste='s hydraulic perferrance is basically consistent with that described in cur FSAR and that the miner variatiens in performance, which could result, de net increase the environmental censequences of the Less of Coolant Accident. Sincer'.y, /(w)'y g g RWA R. C.irnold Vice resident RCA:CWS:tas

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