ML19345B843

LER 80-085/03L-0:on 801023,HPCI Sys Turbine Reached 150% of 4,000 Rpm Full Flow Speed,Rendering Sys Inoperable.Caused by Failure of Turbine Governor & Resistor in Speed Control Circuitry.Governor & Resistor Replaced

ML19345B843
Person / Time
Site:	Pilgrim
Issue date:	11/20/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B838	List: ML19345B837 ML19345B843
References
LER-80-085-03L, LER-80-85-3L, NUDOCS 8012020606
Download: ML19345B843 (1)

Text

NHC FORM 366 U.S. NUCLEAR REGULATERY COMMISSION (7 77)

LICENSEE EVENT REPORT s .

CONTROL BLOCK:

} l l l l l@

6 (PLEASE PRINT OR TYPE ALL REQUl ED INFORMATION) lo lt 8l l9 Ml Al 7

P lP lS l 1 l@l 0 l 0 l -l '0LICENSE UCENSEE CODE 14 15 l 0 lNUMeER 0 l 0 l 0 l - l 025l 0 26l@l LCEN5E 4 l1l1l1l1l@l TYPE J0 l

57 CAT 58 l@

CON'T IOliI [C",C l L60)@l 061 l 5 l0 COCKET l- l 0NUM8 l 2 ERl 9 l 3 }@l 1 l 0 EVENT l 2 lCATE 3 l 8 l 0 l@l75 Il 1REPORT l 2 l DATE OI 8 l 080 l@

7 8 68 69 14 EVENT DESCRIPTION ANO OROBABLE CONSEQUENCES h l_o { 2 l l On October 23, 1980 at approximately 0640 hours0.00741 days <br />0.178 hours <br />0.00106 weeks <br />2.4352e-4 months <br /> following attemots to perform an HPCI I l o 6 31 l system surveillance test, the HPCI system was declared inoperable. During the testing l lo44l l the turbine had experienced an overspeed condition approaching 150 percent of its 4000 l lo isI l rpm normal full flow speed and required operator action to stop it. An immediate in- l lo ls l l vestigation revealed that the turbine's governor and a component in its speed control I lo l7l l circuitry had failed. The-turbine was repaired, tested and returned to service on l October 25, 1980.

1 o Ia i 1 ,

7 8 s 80 E CCCE Su C E CCMPON ENT CODE StBCCCE SU E loIsl 7 8 lS lF l@ l El@ l B l@ lM l El Cl Fl Ul Nl@ lZ l@ lZ l@

9 10 11 12 13 18 19 20

,_ SEQUENTIAL OCCURRENCE REPORT R EVISION ggfpo EVENT YEAR REPORT NO. CODE TYPE NO.

@ s(u,gae l218l0l l-l 23 l0 la l5 l 24 l-l l013I It l l-l 10 l

.,,, 22 26 27 28 29 40 31 32 T K N AC 0 ONP NT ME HOURS S8 i FOR S. SUP LIE MANUPAC RER Z

lJJ A lglJ4 l g l5Zlg 0

lZl@

36 l 0l 0l 0l 0l 37 [41 Nl@ lNl@ lNl@ l44T l 1 l 4 l 747l@

40 42 43 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS lt t o l jThe Terry Turbine's governor was replaced, in kind, and a failed resistor in its controll

i lil l circuit replaced. Because the turbine had ooerated in an overspeed condi' ma. -M aronnade personnel in concert with the manufacturer's recommendations inspected the turbine beariggs

, , gand during operational testing checked its vibration levels. No abnormal conditions werg detected. Following completion of its functional testing, the unit was returned to an l 7 8 9 operable status. 80 PACiury METMOD OF STATUS as POWER OTHER STATUS CISCOVE RY DISCOVERY OESCRIPTION I1 l 5 l l E l@ l 1l 0 l 0 l@l N.A. l l Bl@l Routine Surveillance Testing l ACTIVITY CO TENT -

r.ELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE N.A. l N.A.

l 1 l 86 9l W @ ltoZ l@l 7 11 44 l

45 l

80 PERSONNEL EXPCSURES NUMBER TYPE DESCRIPTION li l 7110' '

l 0 l0 'l@l zl@l" u I PERSONu e'L iN;URiES NUMBER Or ../ TION @

l3 l s3 l9l 0 l 0 l0 l@l12 N.A. l 7 11 80 LOSS OF OR CAMACE TO FActLITY TYPE CESCRIPTION l1l9]lZlhl 7 8 9 10 N.A.

80 l

PU8LICITY NRC USE ONLY

, , , , , $ggf 5$ca'"'ON 012020(e0Is 3.x, i i, , , , , , , ,,,,ij 7 8 9 to 68 89 80 3 M W ~,q W.T n,mM i n 617.,,7 6 A _7QM n