ML19308D073

RO-77-09:on 770203,decay Heat Valves DH4-4 & DHV-41 Failed to Open Upon Remote Actuation During Plant Cooldown.Caused by Personnel Unable to Overcome Valve Drag.Pressure Relief Line Modified

ML19308D073
Person / Time
Site:	Crystal River
Issue date:	02/09/1977
From:	Dubois Q, Steward W FLORIDA POWER CORP.
To:
Shared Package
ML19308D071	List: ML19308D070 ML19308D073
References
NUDOCS 8002270575
Download: ML19308D073 (1)

Text

UCENSEE EVENT REPO "

CONTROL BLOCK:n l l l l l l

(PLEASE PRINT ALL REQUIRED INFORMATION) 1 6

\ NAME LCENSE NUMBER

\% ] lF lL l Cl Rl Pl 3l l0l0l-l0l0l0l0l0l-l0l0l25 l4 PE TYPE 7 89 14 15 26 l1 l1l1l1l l0l1l 30- 31 32 CATEcony "'7PU T S$$A0E OoCKET NUMBER EVENT DATE AEPORT OATE o ' Cont l

• l

• l 7 8 57 58 LP-]

59 ItJ 60 loisinI-InI,Inl71 61 68 10 121013I7171 69 10 12 In la 17 I 71 74 75 80 EVENT DESCRIPTION gg l During plant cooldown in Mode 4 (Hot Shutdown), two Decay 11 eat Valves (DHV-4 and I 7 89 80 g[ l DilV-41) would not open upon remote actuation. They were opened by hand. Redundant i 7 89 80 g[ l systems (atmospheric dump valves) were available. A similar (not report 6 1e) l 7 89 80 0 l problem occurred to a different valve.  ! .

O f (TI-9) 7 89 pnut 80 C E CO E COMPONENT CODE SUPpt R MANUF R VIOLATON O lCl Fl y 7 89 10 lV l A l L l Vl El Xl lAl W 0 3 0 l Nl .

11 12 17 43 44 CAUSE DESCRIPTION A 2 0.O

]

O l Valve motor operator would not overcome valve dran. Toraue settine was in e rn n <:n d l 7 89 20 O l on. operator. Pressure relief line modification iniefnend en nravnn e ra ciirvan ca  !

7 89 80 I I 5A  % POWEA 0*HEA STATUS DSCOVEAv DISCOVERY DESCRIPTON 7 8 9 W l0\0]0]12 l13 10 Mode 4 l W l N/A l 44 45 46 80 p LE S OF nEL ASE AMOUNT oF ACTIVITY LOCATON OF AELEASE 1

7 8 9 U l_j 10 l

11 N/A 44 l l 45 l

80 PERSONNEL EXPOSURES NUMBER TYPE DESCAWTON g[ l l 7 89 l l 11 Ul12 13 N/A l 80 PEASONNEL INJURIES NUMBE A DESCRPTON Ql l 7 89 l l l 11 12 N/A l 80 OFFSITE CONSEQUENCES Ql 7 84 N/A l 80 LOSS OR DAMAGE TO FACluTY DESCRATON 7 89 10 80 PUBLICITY Ml N/A l 7 80 80 ADDITIONAL FACTOAS b]l N/A l

V* ., 8 0 0 2 27 Ogpg so 19 l l NAME: W. P. Stewart / O ,b- PHONE: (813) 866-4159 sPo ees.sef