ML20244D392
Text
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Commonwealth Edison
/' O 960 Nuth Rout 347
.{O7 Morris, Illinois 60450 s
/
q 1
June 27, 1985 h
3 John B.
Hickman Reactor Safety Engineer U.S.
Nuclear Regulatory Commission q'
Washington, D.C.
20555
SUBJECT:
ERDS TEST AT THE LA SALLE UNIT 1 NUCLEAR POWER STATION q
M
Dear John:
'{
.j As per our telephone conversation of June 26, the La Salle j
Unit 1 ERDS Test is scheduled for August 13, 1985.
1 1
It was brought to my attention, that my May 28, 1985 H
letter to you, listing
- the computer points for the test included four digital pointers as identified below:
D952 MAIN STEAM RAD DIV Al i
D953 MAIN STEAM RAD DIV A2 D992 MAIN STEAM RAD DIV B1 i
D993 MAIN STEAM RAD DIV B2
.i These points have only two possible acceptable readings; i
RESET (OCTAL number 0000) or TRIPPED (OCTAL number 0004).
1 1
As per our discussion, we agreed that transmission of the points would follow the same sequence as that in the letter.
I j
have been informed, by my computer personnel, that this could cause j
problems for data transmission, thus these four computer digital j
points will be transmitted after all of t.h e analog values.
l
- j In
- addition,
'the
' format for digital point data transmission is differenct than analog transmission.
The format i
for the digital points is sa follows:
Uj j
6 Alpha Numeric Data Base Sensor Description
~]
characters (left justified), example D952 4 HEX Status Word characters, example 0004 ij j
Example for digital point D992 that is in High Alarm J
(TRIPPED).
,k E111 E 1 1.4
,1 M
The data transmission will start with the 16, character 1
Leader followed by the 20 character analog values, followed by the d.
6 character digital values, followed by the 5 character Follower.
(a~,.
th 7.lo j
j e m iggg[ g 7a h
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i June 27, 1985 A
r
~1
'JJ ERDS TEST AT THE LA SALLE UNIT 1 NUCLEAR POWER STATION j
Page 2 of 2 Following are the list of the 4
HEX status word characters in OCTAL form that will be used for the ERDS Test:
+
I B I T OCTAL MEANING
!1
!j 1
0001 Lo Alarm Ij 2
0002 Lo-Lo Alarm
[1 3
0004 Hi Alarm 4
0008 Hi-Hi Alarm 5
0010 Out-Of-Scan High 6
0020 Out-Of-Scan Low
} l!
7 0040 Value inserted l
8 0080 Removed from Scan jff' 12 0800 Point was not found l:
in catalog 5
15 4000 Bad Value O
There can be various combinations of the above status l
'I BITS to indicate that more than one condition exists.
- Also, note that there are no status BITS set (ie. OCTAL 0000) that means that no alarm or unusual conditions were detected.
f..
4 i If you have any questions, concerns or
- problems, l
v please contact me at (815) 942-8152.
I will obtain a copy of the La Salle Exercise and forward it to your office so that you may evaluate the Scenario before August 13, 1985.
ll l
I l.f Prepared By:
Larr$W. Duchek j
Emergency Planning M
Supervisor i
Approved By:
l f)
J/bhn CT Golden L-l Supervisor Emergency Planning
'i i
,j LWD:wjm l
1.,
cc:
D.L.
Farrar L.D.
Thompson j
N. E.
Wandke G.J.
Diederich j
i f:4 L.D.
Butterfield C.
Gains
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J.C.
Golden P.
Tebbe h
B.B.
Stephenson T.G.
Blackmon i
EOF-f85-6-191/ DOC.I.D.1297A i
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REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIOS)
'I ACCESSION'NdR 8507160625 DOC.DATE: 85/06/27 NOTARIZED: f40 DOCKET s j
FACIL 50-373 LaSalle County Station, Unit 1, Commonwealth Edison C 05000373 i
. A AUTri.N AME AUTHOR AFFILIATION 0 CHEK,L.n.
Commonwealth Edison Co.
GOLDEN,J.C.
Commonwealth Ecison Co.
i RECIP.NAME RECIPItNT AFFILIATION HICKMAN,J.O.
NRC = No Detailed Affiliation Given
)
SUBJECT:
Informs of possible problems for cata transmission during
.j EROS test using digital pointers listed in 850528 Itr.
Computer digital points submitted in 850528 Itr will oe j
transmitted after analog values.
Jj DISTRIBUTION CODE: XE020 COPIES RECEIVED LTR.
ENCL SIZES TITLE: Aodressee Only
'ij NOTES:
05000373
,i OL 04/17/82 i
RECIPIENT COPIES RECIPIENT COPIES ID CODE /NAME LTTR ENCL In Perj ^"5 1TTR ENCL INTERNAL: NRR/0L/TAPHG 1
1
- ECIP, Nh 1
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p i I a
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TOTAL NUMBER OF COPIES REQUIRED: LTTR 2
ENCL k
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