ML19322C366
| ML19322C366 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 02/10/1978 |
| From: | Tally C BABCOCK & WILCOX CO. |
| To: | Williamson R BABCOCK & WILCOX CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160902 | |
| Download: ML19322C366 (1) | |
Text
._....
T y
THE BADCOCK & WILC0X COMPAfiY POWER GEllERATI0ff GROUP 1
To j
R.P. WILLIAMSON - NUCLEAR SERVICE From C.W. TALLY - CONTROL ANALYSIS (EXT. 2003) ses 663.s Cust.
file No.
or Ref.
ECO Subj.
Date SPR 396 FEBRUARY 10, 1978
_lm...........,..........,......6,...ir.
A
Reference:
1.
Letter BNT-1609, J.A. Lauer to C.R. Domeck, T1.2/12B, dated b l
December 5,1977.
d
~
Engineering has evaluated the transient described in SPR 396 resulting in the following comments:
1.
He classification of the transient in Reference 1 was correct and no further coment on this aspect is required.
- 2. De ; decrease h pressurizer level (off-scale low) is indic.ative
.of rapid ' steam generator level increases following the initiation (of AFW. This; undesirable effec.t is symptomatic of high level setpoints. Conversations with Fred Miller of ECO Engineering
,have confirmed ECO's awareness of this problen and their desire ato have it rectified.
In view of the fact that Davis-Besse I has elevated loops, there should be little _ difficulty in-decreasing the level setpoint with appropriate analysis. The funding for this work will be pursued through Project Management.
3.
Engineering has been unable to satisfactorily resolve the dissimilar behavior of the two OTSG's during the transient.
During the 5 to 15 minute period of the transient, the two steam pressures moved in opposite directions and were considerably apart. The plant computer printout says a main steam line' warm up isolation valve was open during this time ("22:S5:S6 2688 MN S'n! Line 2 WU ISO VLV CLOS"), but TECO Engineering says the valve indicator is wired backwards, indicating that it actually was closed until 22:55:56, when an operator openedit.If indeed it was closed until this time, there appears to be no logical explanation for the steam pressure differences. His should be passed on to TECO Engineering, since Plant Design has no further information with which to investigate this anomaly.
QW C.W.Na 8001160fpp
'cc:
J.R. Burris l
R.B. Davis J.A. Lauer R.W. Winks
-.