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Forwards Info on NRC Concerns Re Supports for B2 Tdi Diesel Generator Components & B2 Diesel Exhaust Shroud.Completion of Mods on Piping,Restraints & Support Configuration Prior to Startup from Next Refueling Outage Intnded
	ML20148E442
Person / Time
Site:	Rancho Seco
Issue date:	03/21/1988
From:	Andognini G; SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F; Office of Nuclear Reactor Regulation
References
	GCA-88-193, TAC-67001, NUDOCS 8803250139
	Download: ML20148E442 (70)
	v • d • e

- _ _ _ _ _ _ _ _

- e SACRAMENTO MUNICIP;.L UTILITY Dl?TRICT O P. o. Box 15830, Sacamento CA 95852-1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CAllFORNIA GCA 88-193 MAR 21 1933 U.S. Nuclear Regulatory Commission Attn:

Frank J. Miraglia, Jr.

Associate Director for Projects 11555 Rockville Pike Rockville, MD 20852 Docket 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 TDI DIESEL GENERATOR SUPPORT AND SHROUD CONCERNS

Dear Mr. Miraglia:

Attached is information which addresses your staff's concerns re-garding supports for several B2 TDI diesel generator components and the B2 diesel exhaust shroud.

During a 24-hour endurance run of the B2 TDI diesel generator, cracks developed in an original turbocharger restraint bracket and air start system piping supports.

Additionally, seepage of jack-et cooling water occurred from the exhaust shroud.

(Most of the seepage was attributable to leaking fittings and Dresser coup-ling.)

Attachment I contains information about the turbocharger bracket.

Attachment II addresses the air start system piping supports.

Attachment III supplies information about the exhaust shroud.

When the corrective actions outlined in the attachments have been accomplished, the District will perform another 24-hour endurance run on the B2 TDI diesel generator.

This endurance run will be completed prior to restart.

0 9

8803250139 880321 l

'PDR ADOCK 05000312 I

p DCD I

RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638-9799;(209) 333-2935 l

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MAR 21 1988 Frank J. Miraglia, Jr. GCA 88-193 Following restart, the District will conduct a long-term monitor-ing and evaluation program on both the A2 and B2 TDI diesel gen-erators.

This program was committed to in letter GCA 88-032, dated February 1, 1988, and directs the monitoring of affected equipment on a 90-day interval.

The program will ensure that an unanticipated increase in vibration levels will be detected in a timely manner.

This monitoring will be performed in addition to the surveillance testing required by Technical Specifications.

A long-term study was also committed to in the referenced letter.

This study will evaluate the entire design of the TDI diesel piping and auxiliary skid arrangement to determine if an alter-nate design is more advantageous.

This study is considered a long-range item and will be conducted after Rancho Seco restart, but priot-to the next refueling outage.

It is the District's intent, using the results obtained from the long-term study, to modify the piping, restraints, support con-figuration, and/or change material on the A2 and B2 TDI diesel generators to meet the requirements of ANSI / ASME OM3-1986, if approved.

Shculd the 1986 version of the code not be approved, then the latest draft sha:1 be used as criteria.

These mod-ifications will be completed prior to startup from the next refueling outage.

Please contact me if you have any questions.

Members of your staff requiring additional informatien or clarification may con-tact Steve Crunk at (209) 333-2935, extension 4913.

Sincerely,

/

t G.

Carl Andognini Chief Executive Officer, Nuclear Attachments cc:

A.

D'Angelo, NRC, Rancho Seco G.

Kalman, NRC, Rockville (2)

J. Martin, NRC, Walnut Creek D.

Crutchfield, NRC, Rockville

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ATTACHMENT I Turbocharger Bracket 1

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DEFICIENCY The original support bracket was installed by TDI.

Subsequently, additional supports were installed on the recommendation of Duke Power Company.

See Figure 1.

After completion of a 24-hour endurance run, a small crack was discovered in the original TDI turbocharger support bracket base support.

See Figure 2 (photographs) and NCR S-7880.

II.

EVALUATION OF FAILURE Investigations concluded that the original component was designed with a high stress intensity factor and very low allowances for torsional load.

Based on measured displacement data, equivalent loads were calculated.

These equivalent loads were then applied to each support and the stresses calculated at the failure loca-tion.

The calculations show that stresses at each failure loca-tion were above the endurance limit and that the failure was caused by the cyclic displacement of the turbocharger.

III. CORRECTIVE ACTION Vibration measurements were taken which confirm the acceptability of removing this support bracket.

These calculations show that vibration criteria would be met without the use of the support; therefore, the support is acceptable in its existing configura-tion.

There was a marginal increase in calculated vibration without the support; therefore, the DL trict will replace the bracket with a design which will accept 9: eater torsional loading.

A 24-hour endurance run will be performed on the B2 TDI diesel prior to criticality.

During this run, detailed vibration monitoring of the replaced supports will be performed.

See ECN R-2870 and as-sociated Design Basis Report.

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2870 REV 0'

SACRAMENTO MUNCIPt UTILITY DISTRICT ENGINEERING CHANGE NOTICE SHEET 1

0F 1

C t; TITLE:

Modifications To TDI "B" Diesel to prevent P.Re eato sr.si / Q NicNEst oA class

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S Harris 1

additional failures.

c{;g 4E Fou.oWING SYSTEM (S) WILL BE AFFECTED BY THIS CHANCE John h The EGS System "B" TDI Diesel Generator srsica cNc:MasR ovR Rcvicw suc NccR Sam Bader

.inhn WalHn 1TPE OF ECN wCRx ORDER slNCULAR N MAJOR O sue 0 EASON FOR CHANCE:

To perform various changes to the "B" TDI Diesel to prevent recurrence of the failures which'occured during the 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months run comoleted on 3/17/88.

>ESCRIPTION OF CHANCE:

Institute design changes to the turbocharger supports, starting air line supports, exhaust shroud, governor and various other components and supports to prevent recurrence of failures experienced.

Yr COMMENTS:

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g IP the assuert tat enestions T.t amt T.Z are "Nik* tase tne roamirements of 10cRt50.St do not as unrevienes. Safety Questiaer Deterwination (Sectfos Z.0).is not reimiree. Casalete items 3.0, 4.0, 2.0' tastEftSEE SAFE!T QUEITT13> DETEIWftMATIOD' wiff the prenability of/ocuserence of an accioent previously evaluated irr taa SAA se 2.1 Yar mer increasec' lasir 'for answer-(usa conu nuau on sneess as necessary) will the consaamences of an acriaent previously evaluated in the SAA be increasedT Z.Z Tar we Basis for answer; tuse conunuauon sneets as. necessary)

A3Ucc1, Rev'. 3 Sheet 1 of 2 4

1 tetFRSC.5') Oftfe=INAT10N umREVIEWED 5AFETY QUESTION CETERPl1NAT10N (continued) incor. ant to safety Will the prooaallify of occur-ones of a malfunction of ecuipment

.3 Yes _ No previously ev.tuated in tne SAR os increasect asis for answer

_

inmortartt to safety orvviously iuse continu4uon snetts as necessary)Will tne consecuences ui a malfunction c'f equicment

.a Yes _ No evaluateo in tne SAA De ir. creased!

J Basis. for answer:

luse conunuauon sneen as. necassary) luated previously Will the cassibility for an accioens of a different type inan any eva 2.5 Yer-

_ mir' in tne SAA oe creasec.

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Technical Specificattor.(s) Der Z.7 Yer_ mr_ uf17 the suergin of safety as enfinet in. tne baser for any rechacedt Basis for answer-tuse conunuauon sneess as necassary; eeuired) a copy of tne If ouestion 1.7. is marked "Yes* and

Permanent * (i.e., a s,.cm t.atT enang l

proceours, test or sodification small be forwarned, to the Nuc eabe forwarced to tneL If any guestion is answeres *Yes' is Sectierr 2.0, thu document being r annual USAR unda,a i

Nuclear Licensing Denartment for a detailed Safety Analys s e' continue proces If all answers are "see, ADM-00C3, Rev. I sneet 7. af 2.

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CSIGN CRITERIA USED:

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~XThtS CHANGE CCES NCT AFFECT CCNTRCL ACCM LNSTRUMENDTICN

"" TblS CHANGC AMCTS CCNTRCL RCCM INSTRUMENUTICN. SEE ANALYSIS The failure rodes of the diesel generators are not inpac,ted by this nodification SPEC:At. MAINTENANCE RECUlREMENTS:

Ib rdditional traintenance requirerents are being added.

SPECAL CPERATING RECU1REMENTS:

These nodifications will not affect the cperating procm:res and requiremnts.

VERtFICATICN ulu41A:

See Attached CCMMENTS:

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y COCJIDNT ENG'NEER'S CHECXLIST DE5tGN SAS'S REPCRT Cognizant Engineer Person Rescensi:le indicates by *Y' for program or "N" programs initials items requiring review martec 'Y" or *N' X.

Design Considerations USAR Commi*.ments Fire Protection Ampacity Impact (Due to Fire Protectio'n)

Safety Impact /

(Due to Fire Protection)

Safety Impact Program (II/I)

Electrical Cable and Raceway

. Separation Program RadiologicalConside, rations /

ALARA Environmental Qualifications Seismic Qualifications Human Factors W

Reg Guide 1.97 HELBA c

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DESIGN BASIS REPORT DBR REY. NO.

1 ECN R-2870 DATE 3/22/88 DISCIPLINE f'ECHANICAL NCR N/A

~

POD N0.

N/A WR. NO.108583 I.

Purcose of Desion Chance Tne purpose of tnis design change is to prevent recurrence of tne failures excerienced on the "A" TDI diesel curing tne 24 nour run completed on 3/17/88.

In addition to Ine deficiencies icentified following tne 24 nour run, a modification is being made to tne pneumatic control system to prevent a lack of shutdown signal reset after a manual test of tne overspeed trip funtion.

Inis pneumatic control system problem was excerienced on tne "A" TDI ciesel and is documented on NCR S-7841.

Tne following deficiencies were documented following tne 24 nour run.

O A crack appeared in the support bracket for tne starting air solenoid valves (NCR S-7880).

O A small crack developed in the turbocnarger support bracket (NCR S-7880).

4 A small quantity of jacket water was discovered to be seaping from tr.<! exnaust shroud (NCR 7881).

O Cracks were found on two additional supports on tne starting air header, 10110-3"-xx (NCR 57894).

Shroud Modification

~

To prevent future leakage of the jacket water system, the entire exhaust shroud will be removed.

Tne jacket water supply and return lines will be capped.

Tne exnaust pipes will be insulated with 2" of fiberglass insulation to reduce the neat load in the building.

Succort >'caifications Jacket Water System - Four new brackets will be added to support the 4" jacket water neader whicn was previously supported from tne exnaust snroud. A new support will be added to the 6" jacket water pipe to prevent vibration which is 1800 out of pnase with the east / west motion of the top of the engine.

Turbocharger Support - Tne turbocnarger support bracket wnicn cracked will be replaced and stiffner plates will be added for additional strengtn.

Starting Air Supports - Tne support bracket for tne starting air solenoid valves will be redesigned.

Five supports on the starting air header which runs the lengtn of the engine will also be redesigned to prevent future failure.

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DESIGN BASIS REPORT DBR REY. NO._ i ECH R-2870 DATE 3/22/88 DISCIPLINE HECHANICAL NCR N/A M00 NO.

N/A WR NO. IC8683 Pneumatic Control Modification Tne Humphrey snuttle valve requires a snarp pressure gradient in S ven a slow falling (or rising)f order to function relisole.

If i

Abandonment o signal it will sometimes fail to seal completely.

tne long 1/4" 0.D. tuce run from the on engine logic to anc frcm tne stop/run valve in favor of a much snorter, direct tuce run will recuce tne volume of air to ce vented and decrease tne pressure crop wnien will cause the snuttle valve to get a snarper pressure enange than it is now getting during the reset transient.

Inis enange will ensure proper resetting of tne snuttle valve following a test snutdown signal and eliminate the need for manual operator action.

II.

Design Criteria Snroud Removal According to IMO Delaval, tne dlesel vendor, the exnaust snroud serves no function other than to protect tne environment and personnel from radiant neat and to support.ne jacket water header.

Calculations nave been completed to demonstrate tnat tne additional neat load into the building is acceptable.

Tne insulation being added will provide adequate personnel protection.

Support Modifications Calculations nave been completed to demonstrate that tne jacket water and starting air system piping meet thermal, weight, and l

seismic design requirements based on tne new support configuration.

III. Calculations and Cesian Information l

The following calculations nave been completed to support e.nis modification.

Z-EGS-M2102 Turbocharger Vibration Data Z-EGS-M2428 Vibration Evaluation of Ine Starting 1

Air System Z-EGS-M2400 Tnermal, weignt and seismic evaluation of tne starting air system Z-HVS-2427 Evaluation of additional neat load into building from shroud removal

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DESIGN BASIS REPORT DBK REV. NO.

I ECN R-2870 DATE 3/22/88 OISCIPLINE PECHANICAL NCR N/A WR. NO. 108583 MOD NO.

N/A Inermal, weignt, and seismic analysis of Z-EGS-M2113 the jacket water cooling system Failure mode analysis of tne tureocnarger Z-EGS-M2429 and pipe support failures All modifications to the pressure boundary of tne starting air and the jacket water systems will be completed in accordance witn ANSI Modifications to the pneumatic control B31.1, Power Piping Code.

system tubing will be in accordance with SMUD Construction 5305.78C and will be supported per Specification NEPM Index No.All materials used will meet Quality Class 1 Spec. I 1155.

requirements.

VII. Verification Criteria Snroud Removal and Support Modifications _

Vibration monitoring will be completed on Ine jacket water and starting air systems following tne modifications to demonstrate conformance with ANSI /ASME OM-3 requirements.

~*'

Pneumatic Control Modifications _

Tne control system logic will De verified by performing procedure A leak tightness of the tubing and fittings TEMP-004 and SP-57A.

will be performed at an internal pressure of 60 psig.

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ATTACHMENT II Air Start System Piping Supports

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I.

DEFICIENCY After completion of a 24-hour endurance run, a large crack was discovered in the support bracket for the start air lines near the starting air solenoid valves.

See Figure 1 and NCR S-7880.

Additionally, cracks were discovered in two other air start sys-tem line supports.

See Figures 2 and 3 and NCR S-7894.

II.

EVALUATION OF FAILURE Investigations concluded that the original component was designed with a high stress intensity factor.

Based on measured displace-ment data, equivalent loads were calculated.

These equivalent loads were then applied te each support and the stresses calcula-ted at the failure location.

The calculations show that stres-ses at each failure location were above the endurance limit and that the failure was caused by the cyclic displacement of the piping.

III. CORRECTIVE ACTION Vibration measurements were taken which confirm the acceptability of these support brackets in their as-found condition.

Stress levels were within allowable limits.

The supports are acceptable in their existing configuration for thermal, dead weight, and seismic design requirements.

There was a marginal increase in calculated vibration without the supports; therefore, the District will replace the supports.

A 24-hour endurance run will be performed on the B2 TDI diesel prior to criticality.

During this run, detailed vibration non-itoring of the replaced supports will be performed.

See ECN R-2870 and acsociated Design Basis Report.

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l i Defen Orccessing is continued.
Nuclear Licensing Ceoartnent for a detailed Safety Ana ys s* continue precessing of If all answer are *w, AC=4CO2, Rev. 2 Sheet I of 2.
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AlC.S 7 T9 Y REY.
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10C7R$0.59 APMICAstLITY DETERMIMATION i
i wd:
1.0 The procedure, procedure change, modification, test or experiment be ng rev e 1 tequires a change to the Technical Specifications!aoI a w ess rAe.
rc.c. A.
6 see. s do 1.1 fes 4
sa,i, for an,wer:
sappotis.
A nt ewd m e d 9 y (w> A.e. A Eddad i,v els, dA l o n e.
rke cf.e, eld 'il wo l ' 'iA he le d A)o add I,o vo. \\
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Wse continuation sheets as necessary) g' i
Sasis Document being no fon'ger true or
_ No_ N _ Results la the infonnation in any 1.icens ng s
accurate or violates a requirement in any Licensing Sasis Occument (e Spec 6.17, changes to the USAA, or cnanges to 1.2 Yes-to Radwaste Systmas as defined in Tecft.
the Emergency Plan, see 4.14).
Pennanent or _ Temporary)
Mo b' d e NS N9 84 5/5 oc a nte 3
et f c.
(
im u led ( Rer usAA 6 ele.//w
s. 2. 3.1. 2 ')
7' A c.
s~ d i c e. (
Basis for answe:
/%.a bt Alc A w,H N0/
/m ica e. f M e.
E~,n e,., e ue n
/
Wse continuation snests.as necessary) Q' a.a.b./y_ //?a " &/
c.'!
i ity can be isolamented c
If the answer to question 1.1 is 'TES,* A Safety Analysis is required ggf 3. the
'p, 2
h (see Section 5.Z of RSAP-0901).
i tion is required and If the t. wer to question 1.2 is 'TES
then an unreviewed Safety Question Deten Sectio,e2,0ofthisformsustbeccuoIeted.
l and an unreviewed Safety Question Detensination (Section 2.
Casolete items 3.0, a.0, and 5.0.
l l
UNREVIEWED 5AFETY QUE5710N OtTijmtNAf!0N
_ iso _ Will the pro 64011Ity of occurrence of an accident previ 2.0 2.1 Yes_
incr= & nt Sasis for answer:
(use continuation sneets as necessary) 2.2 Yes _ me
_ will the consequences of an accident previously evaluated in Basis for answer:
(use continuation sheets as necessary)
Aon-0003, Rev. 3 Sheet 'I of 3 OR!ENA
se
/
10CFit50.5g OETERMINATION
/
REVIEWED SAFETY QUESTION DETERMINAT!ON (continued) i inmortant to safety
.0 No Will the probability of occurrence of a malfunction of equ anent
~
previously evaluated in the SAR be increased?
.3 Yes
~
Sasis for answer:
i l
(use continuation sneet Fas necessary)Will the consequences of a malfunction of equipnent in evaluated in the SAA be increased?
2.4 Yes
_ No Sasis for answr:
(Use continuation sheets as necessary) i ly Will the possibility for an accident of a different type than any evaluated prev o 2.5 Yes
_ No in the SAR be created?
Basis for answer:
~ ~ " "
7!
(use continuation sheets as necessary) evaluated in the SAR if.
No,_,,_,,, Will the possibility for a nelfunction of a different type than any 2.6 Yes be created?
s'.!?
de Sasis for answer:
i.n:
i....
(use continuation sheets as necessary) ification(s) be 2.1 Yes No
_ Will the margin of safety as defined in the bases for any Technical Spec reduced?
Sasis for answer:
l (Use continuation sheets as necessary) i d) a copy of the If question 1.2 is marted "Y'es* and *Pennanent* (i.e., a permanent LB0 change re i
i procedure, test or nodification shall be forwarded to the Nuclear L cens ng forwarded to the annual USAR update.
If any question is answered '7es* in Section 2.0, the docunent being reviewd i
d wuclear Licensing Oeoartment for a detailed Safety Analysis before processing i for review.
If all answers are *40,* continue processing of docunent and forward to the PRC q-0003, Rev. 3 Sheet 2 of 3 M
t i
W I
9
/
,j 1
l 10C71150.59 OETEfWitinAYt0N 3 !/ T 38
M DATE 3.0 PREPAAE0 BY:
I QATE 4.0 C31 Eld 0 BY: _
f-I 5.0 PflC REVIEW:
TES()
40 ( )
50.54(p) SECUAITY REVIEW REQUIRED 5.1 YES ( }
W ( ).
50.54(q) EMERGENCY P90GAAM REVIEW REQUIRED 5.2 fE5()
NO ( )
50.54(a) QUALITY PROGRAM REVIEW REQUIRED 5.3 DATE 5.4 APPROVED BY PRC CHA!PMAN 4
4 J
l l
l A0M-0003, Rev. 3 Sheet 3 of 3 l
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2870 REV 0'
SACRAMENTO MUNCIP/
UTILITY DISTRICT ENGINEERING CHANGE NOTICE SHEET 1
or 1
Cri TITLE:
Modifications To TDI "B" Diesel to prevent P.ar Aaco ev,; /Q nicsE:T oA class additional failures.
S",,h;,N"""I' 1
ME FOU.OWING SYSTEM ( S ) WILL BE AFFECTED BY THIS CHANCE John V i
sistem sucinssa own acVisw suc:=cca The EGS System "B" TDI Diesel Generator Sam Bader
.1nhn WalHn 1TPE or CCM work oRo(R SINGULAR U MAJon O aue 0 EASON FOR CHANCE:
To perform various changes to the "B" TDI Diesel to prevent recurrence of the failures which'occured during the 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months run completed on 3/17/88.
JESCRIPTION OF CHANCE:
Institute design changes to the turbocharger supports, starting air line supports, exhaust shroud, governor and various other conponents and supports to prevent recurrence of failures experienced.
4
'r
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i COMMENTS:
CocM12dNT ENGa/DATE oV AL,4 F REVIEW /DATE 013 $UPV EMCR/D AT E ggg9 gyq9 SAFEff yggO NO Q h D'
GM.hMh M.[Ls/ Phon [Uinto No outnco K U
?
SCIPLINE ENG MANAGER /oATE M G A, NUCLEA GlhCEmi /DATE D I R, oPERATaoh & MAINTENANCE /QATE k
5 f$
h Oca*ast ois***aovso Oissutoconocceneroissugronwo==f g oas/Tesi conettre 0 =c =ccas=6 conetcts
\\
MCA/0 ATE tRTM to DCI 00CumEwt CoMTRoL/DATE DotvMEut control /DATE sysiCm (NCR/0*TE CoCNIZAN1 ENCR/Datt ADM072 ADM-072 REV e
1es e e.se :r- = twa-ew EcN R -217 o any.
O sauss wet::
N/A.__
.: m e e.
'037.10.59 AP't.l0 ABILITY Of.TEP"! NATION ine procecure, procacure cnange, socification, test or exneriment oeing reviewec:
no X 2ecuires a enange to tne Tecnnical $cecifications!
f /ge.
Th Tee / wied
.5 pe ei Dead o ca s clo,0c $ o.ddte.s sDodivodasI
.1 Tes sasis for answer:
co m oo,oe a+< a.ad m.ocoris w A. e. x w, it Ae m od.AJ h
+he.
s u hl( e e. f E c M.
( Ref Tec.h 6 pec
.Sec. foods 3.7 l-
5. 7, Z.
I af. & )
(no carrunuuon sneeu as necenarys i
longer true oe- -
_ No1 Results in tne informat' ion In any Licensing Basis Occument be ng noac= ur
.2.
Yer to Adamassa Systems as oefined in Teca. Spec 6.17, enanges to tne USAA. or enanges is tae: seemncy Pian, see 4.141.
~
(
Pennanent or Tassorary) im pa.c.le.cl ( Ae C Mo Iie e n.s i as ba.s s's da c.a.,e e n ls
o. te
-?'05AR Se.c.Iion
s. 2. 5 "T. 2 f
r h e.
s u. b i e. L +-- e e. M
'w, ll..- co f dinpa.e4.
nasis for answer.
Q a.a( lh is. a a.a. (.
F /, e.
E m e t e e. x> c. n P/a.s>
or i
(use comunuauan sasets as. nocassary4 If the answer"s.s nuestioR* T.I it "T15',* A Safet[ Analysis is reesired I
t see, c rein-2 of as e. coot).
IF ther answer tar ouestier 121s "rt3",*' the&Wlasreviamed. safety Qasstiour Determinatiour Sectier LO.of tais.forereast to amepletes.-
n If the answert te ouestions T.1 amt T.Z are W ther-the reautrements of 10cPR50.59 en not as uereelemed. Safety @aestier Qeterisinatian (Secrfes LC).is not_ reintres. Casalete items 3.
0" UNREVISEIISAFETT* QutITTom'OETEIWttNATIQF wilt the prenability of/ occurrence of an accioent previously evaluted irr tne SAA De Li Yer me increasec
(
nasir 'f0f-ansker*,,,..
(Use cDRU nuation snetts as necessary)
I Will the consemences, of an acrioent previcusly evaluted in the SAA be IncreasedT LZ Ter Me sasis for answer-1 i
a tuse continuau on sneetr as necassaryJ l
Aad.coc1, Re'v. 3 sheet 1 of 3 e
I I
1ccMtSC.5? Oft'e*1NaTt0N uwAgylfA3 SAFETY CUESTION CETERMINAT!0N (continued) i cor*.cnt to safety Will the procaniliiy of oc:ur-ence of a malfunction of scutawns n
.3 Tes ~ no previously ev.tuated in the SAR De increased!
, asis for ariswen__
m incertarts to safety cruiously Tuse -osunuauon snents as necessarylWill the czmsecuences of a malfunction of eculowfit
.a Yes~ no evaluated in the SAA ce increased!
Basis. for answen iuse conunuuan sneeu as. necessary) than any evaluatec oreviously sel Will ue possibility for an acticent of a different type m sne SAR oe :.-eatec.
2.5 Y er-_
sasis for answert,_
...a.
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sing is continued.
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Eee Attacted FAILURE MCCES:
3 D4S CHANGE CCES NCT AFECT CCNTRCL ACCM INSTRUMENDECN C THS CHANGE AFECS CCNTRCL ACCM INSTRUMENDUCN. SEE ANALYSIS The failure modes of the diesel generators are not irpac,ted by this rodification SFAL MAINTENANCE RECUtREMENTS:
fb additional raintenance requireTnts are being added.
SPEC:AL CPERAUNG RECUREMENTS:
These rodifications will not affect the cperating proce1Tes and requiremnts.
VER1RCATICN CRITERIA:
See Attached CCMMENTS:
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'Y' for program or 'N' programs initials items requiring review marxed,*Yd e r
T' X.
Design Considerations USAR Commit.ments Fire Protection Ampacity Impact (Due to Fire Protectic'n)
Safety Impact /
(Due to Fire Protection)
SafetyImpactProgram(II[I)
Electrical Cable and Raceway
. Separation Program Radiological Conside,, rations /
ALARA Environmental Qualifications Seismic Qualifications Human = actors Reg Guide 1.97 HELBA t
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DESIGN BASIS REPORT DBR REV. NO.
1 ECN R-2870 CATE 3/22/88
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DISCIPLINE t'ECHM!ICAL NCR N/A POD NO.
N/A WR. N0.108583 I.
Purcose of Design Cnance Tne purpose of tnis design change is to prevent recurrence of tne failures experienced on tne "A" TDI diesel during tne 24 nour run completed on 3/17/88.
In addition to tne deficiencies icentified following tne 24 nour run, a modification is being nace to tne pneumatic control system to prevent a lack of snutcown signal reset after a manual test cf tne oversceed trip funtion.
Inis pneumatic control system cronlem was excerienced on tne "A" TDI ciesel and is documented on NCR S-7841.
Tne following deficiencies were documented following tne 24 nour run.
O A crack appeared in the support bracket for tne starting air solenoid valves (NCR S-7880).
O A small crack developed in the turbocnarger support bracket (NCR S-7880).
O A small quantity of jacket water was discovered to be seaping from the exhaust shroud (NCR 7881).
O Cracks were found on two additional supports on the starting air neader, 10110-3"-xx (NCR S7894).
Shroud Modification To prevent future leakage of the jacket water system, the entire exhaust shroud will be removed.
Tne jacket water supply and return lines will be capped.
Tne exnaust pipes will be insulated with 2" of fiberglass insulation to reduce the neat load in tne building.
Support Focifications Jacket Water System - Four new brackets will be added to support the 4" jacket water neader wnicn was previously supported from tne exnaust shroud.
A new support will be added to the 6" jacket water pipe to prevent vibration wnich is 1800 out of pnase with the east / west motion of the top of the engine.
Turbocharger Support - Tne turbocnarger support bracket wnich cracked will be replaced and stiffner plates will be added for additional strength.
Starting Air Supports - Tne support bracket for tne starting air solenoid valves will be redesigned.
Five supports on the starting f
air header wnich runs the lengtn of the engine will also be redesigned to prevent future failure.
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DESIGN BASIS REPORT 08R REV. NO.
1 ECN R-2870 DATE 3/22/88 DlSCIPLINE t'ECHANICAL NCR N/A MOD NO.
N/A kR. NO. 108583 Pneumatic Control Modification Tne Humphrey snuttle valve requires a snaro pressure gradient in order to function reliable.
If given a slow falling (or rising)f ADardoncent o signal it will sometimes fail to seal completely.
tne long 1/4" 0.0. tuce run from Ine on engine logic to anc frem tne stoo/run valve in favor of a much snorter, cirect tuce run will reduce Ine volume of air to te vented and decrease tne pressure crop wnicn will cause the snuttle valve to get a snarper pressure cnar.ge Inis enange will tnan it is now getting during tne reset transient.
ensure proper resetting of tne shuttle valve following a test snutdown signal and eliminate the need for manual operator action.
fl.
Desian Criteria Snroud Removal According to DIO Delaval, the diesel vendor, the exnaust snroud serves no function other tnan to protect tne environment and personnel from radiant neat and to support tne jacket water header.
Calculations nave been completed to demonstrate tnat tne additional neat load into tne building is acceptable.
Tne insulation being added will provide adequatre personnel protection.
Support Modifications Calculations nave been completed to demonstrate Inat tne jacket water and starting air system piping meet thermal, weignt, and seismic design requirements based cn tne new support configuration.
!!:. Calculations and Cesian info maticn Tne following calculations nave been completed to support tnis modi fication.
Z-EGS-M2102 Turbocnarger Vibration Data Vibration Evaluation of the Starting 2-EGS-M2428 Air System Thermal, weignt and seismic evaluation Z-EGS-M2400 of the starting air system Evaluation of additional neat load Z-HVS-2427 into building from shroud removal j
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DESIGN BASIS REPORT DBR REY. NO.
I ECH R-2870 DATE 3/22/88 ~~~
DISCIPLINE PECHANICAL NCR _N/A MOD NO.
N/A WR, NO. 108583 Z-EGS-M2113 Tnermal, weignt, and seismic analysis of the jacket water ccoling system Z-EGS-M2a29 Failure mode analysis of tne turcoccarger and pice support failures All modifications to tne pressure boundary of tne starting air and the jacket water systems will De completed in accordance with ANSI B31.1, Power Piping Code.
Modifications to tne pneumatic control system tubing will be 17 accordance with SMUD Construction Specification NEPM Index No. 5305.78C and will be supported per Spec. I 1155.
All materials used will meet Quality Class I requirements.
VII. Verification Criteria Snroud Removal and Support Modifications Vieration monitoring will be completed on tne jacket water and starting air systems following the modifications to demonstrate conformance with ANSI /ASME OM-3 requirements.
Pneumatic Control Modifications The control system logic will De verified oy performing procedure TEMP-004 and SP-57A. A leak tigntness of tne tubing and fittings will be performed at an internal pressure of 60 psig.
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ATTACHMENT III i
Exhaust Shroud
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DEFICIENCY During the performance of a 24-hour endurance run, seepage was observed from the exhaust shroud.
The seepage was discovered at the stiffeners located between cylinders 2 & 3 and 3 & 4.
No cracks in the shroud could be found.
Leakage was also observed at several mechanical joints (swagelock fittings and Dresser coupling).
See NCR S-7881.
In a previous 24-hour run, cracks were found in the heat-affected zones which were repaired and subsequently examined.
The shroud was hydrostatically tested for pressure-retaining capacity.
II.
EVALUATION OF FAILURE Total leakage was observed to be approximately 1.5 gal / hour.
This is considered minimal and within makeup capability.
III. CORRECTIVE ACTION To provide added conservatism on vibration issues with respect to the exhaust shroud, the B2 TDI exhaust shroud will be removed and the jacket cooling water to the shroud blanked off.
The exposed exhaust header will be insulated and supports installed on the 4-inch jacket water return header.
A 24-hour endurance run will be performed on the B2 TDI diesel prior to criticality.
During this run, detailed vibration mon-itoring of the replaced supports will be performed.
See ECN R-2870 and associated Design Basis Report.
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~~SACRAMENTO MUNCIP/_ UTILITY DISTRICT ENGINEERING CHANGE NOTICE SHEET l~~
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Cri TITLE:
Modifications To TDI "B" Diesel to prevent P.Rr Aa Eo si,:i 4 /Q ' H I CHE S T Q A CLASS additional failures.
S,,hl, Harris PROPOSER CNC NO ME FOLI.0 WING SYSTEM (S) WILL BE AFFECTED BY THIS CHANGE John h i
The EGS System "B" TDI Diesel Generator SYSTEM ENGINEER DVR REV]EW ENGINEER Sam Bader John Walkin 1YPE OF ECN NORK ORDER SINCULAR N MAJOR O aue 0 EASON FOR CHANCE:
To perform various changes to the "B" TDI Diesel to prevent recurrence of the failures which'occured during the 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months run completed on 3/17/88.
>ESCRIPTION OF CHANGE:
Institute design changes to the turbocharger supports, starting air line supports, exhaust shroud, governor and various other components and supports to prevent recurrence of failures experienced.
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COGNI2dNT ENGR /DATE QUAllF REVIEW /0 ATE 01SL SUPV ENCR/DATE 08R7 DVR7 SAFETY yggy NO Q h GM.h6kQ Y M.f L s/P h0N[u1REo No OutRED QU R 7 SCIPLINE ENG MANAGER /DATE M C R, NUCLEA CINEERI /DATE D I R, QFERAT10N & MAINTENANCE /DATE I
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If5 the answers to ouestions. T.1 and: T.I are "Nac* therr the roouirments of 10cPR50.59 do not a unroeiewed. Safety Question Determination (Sectfas Z.0'.is noc: ro6uirec. casolete itaus 3.0, 4.0 l
1.0 1.setPJIBE SAFETT QUEITTQu' QETSHMINATIt3F W117 the prenability of/ occurrence of an t.=ciment previously evaluated in-the SAA be 2.1 Ter me increased!
sasir 'for answer:
(usa conunuanon sneeu es necassaryJ Wilt the consecuences of an accieent proviously evaluated in the SAR be increasedT Z.Z Yar war sasis for answer:
tuse conunuauon sneets as. necessaryJ A:N 03c2, Rev. 3 Sheet 1 of 3 G
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i 100PR$C.58 O!TiewfNATION UNREYIEWED SAFETT CUESTION OETERMINATION (centinued) to safety Will tne procacilit'y of occur-ence of a analfunction of vovi:rnent incertant
.. 3 Yes ~ No previously ev.tuated in the SAR oe increased?
, asis for answr"
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f previously
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iuse ontinuation snetts as necessary;Will the consecuences of a malfunction c'f touitynent incertartt to s 4 Yes _ No evaluated in the SAR De increased!
Basis. for answer
~~iuse continuation sneets as. necessary) i l ted previously Will the possibility for an accioent of a different typr taan any eva ua we'~~
~~':.5 Yer-in tne SAR oe c.eate c Basis for answert~~
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- - - = ~ - -
(use continuation sneers as neesssaryJ e i t SAR-Wilt the possibility-FEE mat /vnetion of a. different type than any evalua 2.6 Tes her be createdr.
Basir for answer:
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(use continuatiorr saaess as necessary) 2.7 Ter _ No_
_ utTT the surgin of safety as oefinest, irr tast bases for any Tech reducedT Sasis for answerr luse continuation sneets as necassary) i d) a copy of the If ouestion 1.2. is marted "Yes* and "Permanent * (i.e., a pennanent 1.80' ch proceourt, test or sedification shall be forwarood, to the Nuclear annual usAR updata.
f rced to the.
If any guestion is answered *Tes' in Sectiotr Z.0, the docLsnent being r i
f rocsssing is continued.
Nucisar Licensing Geoartment for a detailed Safety Analys s be ore pforware to tne PRC for amo,* continue processing of cocurent and If all answers are ADM.COC3, Rev. 3 Sheet Z of Z 1
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X TMS CHANGE CCES NCT AFFECT CCNTRCL RCCM INSTRUMEINDT1CP[
. THS CHANGE AM CONTRCL RCCM INSTRUMENTATICN. SEE ANALYSIS The failure rmdes of the diesel generators are not inpac,ted by this tredification NL MAINTENANCE RECUtREMENTS:
ib additional maintenance requirements are being ada.d.
PEC:AL CPERATING RECUtREMENTS:
These nnfifications will not affect the operating prott@res and requirerents.
IERtRCATICN wauntA:
See Attached
~~CMMENTS:~~
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, < u, cart Nuc 1AA Art vtN tATICM g,ar g curi,,,sr;tVC 1,, AAL Cart
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COC.JIZANT ENGINEER'S CHECXLIST DESIGN SA5 5 P.EPCRT Cognizant Engineer Person Rescensisle indicates by "Y' for orogram initials items or 'N" programs requiring review ma rx ec Y
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Design Considera:icns USAR Commit.ments Fire Protection Ampacity Impact (Oue to Fire Protectio'n)
Safety Impact /
(Oue to Fire Protection)
SafetyImpactProgram(II[I)
Electrical Cable and Raceway
. Separation Prograr Radiological Considerations /
ALARA Environmental Qualifications Seismic Qualifications Human ?3C ors Reg Guide 1.97 HELBA m, +
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~~a DESIGN BASIS REPORT D8R REY. NO.~~
~~1 ECN R-2870 DATE 3/22/88 OISCIPLINE HECHANICAL NCR N/A MOD NO.~~
~~N/A WR. NO. 108583 Pneumatic Control Modification Tne Humphrey snuttle valve requires a snarp pressure gradient inI order to function reliable.~~
~~Abanconment o signal it will sometimes fail to seal completely.~~
~~tne long 1/4" 0.D. tute run from the on engine logic to anc frcm Ine stop/run valve in favor of a. uch snorter, direct tuoe run will T~~
reduce tne volume of air to ce vented and decrease Ine pressure drop wnicn will cause the snutt11 valve to get a snarper pressure cnangeTnis enange will than it is now getting dur..'.? tne reset transient.
~~ensure proper resetting of tne snuttle valve following a test snutdown signal and eliminate the need for manual operator action.~~
~~II.~~
Design Criteria Snroud Removal According to IMO Delaval, the diesel vendor, the exnaust snroud serves no function other than to protect the environment and personnel from radiant neat and to support the jacket wat Tne insulation being neat load into the building is acceptable.
~~added will provide adequate personnel protection.~~
1 Support Modifications Calculations nave been completed to demonstrate that tne jacket water and starting air system piping meet thermal, weight, and seismic design requirements based on the new support configuration.
~~III. Calculations and Desf on Information_~~
~~l Tne following calculations nave been completed to support this modification.~~
~~i l~~
Turbocnarger Vibration Data Z-EGS-M2102 Vibration Evaluation of the Starting Z-EGS-M2428 Air System Tnermal, weignt and seismic evaluation Z-EGS-M2400 of the starting air system Evaluation of additional heat load Z-HVS-2427 into building from shroud removal
~~~~-~~
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DESIGN BASIS xEPORT DBR REY. NO.
I ECN R-2870 DATE 3/22/88 DISCIPLINE PECHANICAL NCR N/A WR. NO. 108583 MOD NO.
N/A Z-EGS-M2113 inermal, weignt, and seismic analysis of the jacket water cooling system Failure mode analysis of tne turoocnarger Z-EGS-M2429 and pipe support failures d
3.11 modifications to the pressure boundary of tne starting air an tne jacket water systems will be completed in accordance witn ANSI Modifications to tne pneumatic control 831.1, Power Piping Code.
system tubing will be in accordance.with SMUD Construction 5305.78C and will be supported per Specification NEPM Index No.All materials used will meet Quality Class I Spec. I 1155.
requirements.
VII. Verification Criteria Shroud Removal and Support Modifications Vibration monitoring will be completed on Ine jacket water and starting air systems following the modifications to cemonstrate conformance with ANSI /ASME OM-3 requirements.
Pneumatic Control Modifications The control system logic will De verified by performing procedure A leak tigntness of tne tubing and fittings TEMP-004 and SP-57A.
will be performed at an internal pressure of 60 psig.
5 of 5 4
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v t e Letter Sequence Other
TAC:67001, (Approved, Closed)
Initiation Acceptance... Administration Meeting Questions Answers Results Approval, Approval, Approval Other: ML20148A165, ML20148E442, ML20149F003
MONTHYEAR1988-03-10 [Table View]

ML20148E442

Text

Dear Mr. Miraglia:

. '..

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